Examkin

Sentence Structure and Formation

444 questions

All types444Multiple choice368Ordering15Fill in the blank61
Question 141Question →

The following segments describe the sequential steps in restoring an artwork. How should these segments be ordered to complete the sentence in a grammatically correct sequence that maintains parallel structure and presents the steps chronologically?

'To restore the historic painting, the conservator focused on ________, ________, and ________.'

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological and parallel order is: cleaning the surface grime, repairing the torn canvas, and varnishing the completed work.
The correct order follows the logical timeline of art restoration (cleaning first, repairing second, and varnishing last) while maintaining parallel structure by using three gerund phrases ('cleaning', 'repairing', 'varnishing') that all correctly follow the preposition 'on'.

Step-by-Step Solution

1
Identify the grammatical constraint set by the sentence introduction.
The preposition 'on' requires a list of parallel gerund phrases ('cleaning', 'repairing', 'varnishing') to function as objects of the preposition.
This ensures the sentence maintains a consistent and parallel grammatical structure.
2
Determine the logical and chronological sequence of the art restoration process.
Surface cleaning must happen first, followed by structural repairs to the canvas, and finally the protective varnishing.
Varnishing cannot occur before repairing, and repairing cannot occur before cleaning the surface.
3
Assemble the segments in the determined order and verify the conjunction placement.
The resulting sentence is: 'To restore the historic painting, the conservator focused on cleaning the surface grime, repairing the torn canvas, and varnishing the completed work.'
This order places the conjunction 'and' before the final element, satisfying both chronological logic and parallel syntax.

Key Concept

Parallel Structure
Estimated Time:1m 0s
Question 142Question →

The following passage is about advancements in civil engineering:

Modern materials scientists have developed "self-healing" concrete, a building material embedded with bacterial spores and nutrients. Although the concrete remains intact under normal conditions, moisture enters when cracks begin to form, and this activates the bacteria to produce limestone that seals the fissures.

Which of the following options most effectively subordinates or coordinates the clauses in the underlined portion to establish a grammatically correct and logical relationship?

Show answer & explanation

Answer: NO CHANGE

Answer

The correct phrasing is the original version, which correctly subordinates the introductory clause using a comma and coordinates the subsequent independent clauses.
The correct phrasing uses the subordinating conjunction 'Although' to set up a dependent clause of concession, which is properly separated from the main independent clause by a comma. The coordination of the remaining clauses is also grammatically correct.

Step-by-Step Solution

1
Analyze the relationship between the first clause and the subsequent clauses.
The first clause ('Although the concrete remains intact under normal conditions') is a dependent clause that establishes a contrast with the main idea of moisture entering. Therefore, it requires a subordinating conjunction like 'Although'.
Identifying the clause type is necessary to determine the correct punctuation and conjunctions needed.
2
Examine the punctuation separating the dependent clause from the first independent clause.
A dependent clause starting with 'Although' at the beginning of a sentence must be separated from the independent clause with a comma, not a semicolon or a period.
Using a semicolon or period here would create a fragment or punctuation error.
3
Examine the coordination between the two independent clauses that follow.
The second clause ('moisture enters when cracks begin to form') and the third clause ('this activates the bacteria...') are independent. They are correctly joined by the coordinating conjunction 'and'.
Joining two independent clauses with only a comma creates a comma splice, so coordination is required.

Key Concept

Subordination and Coordination
Question 143Question →

The following passage contains an underlined portion.

In 1609, Galileo Galilei constructed his first telescope. Which allowed him to observe the craters on the Moon and the four largest moons of Jupiter.

Which option is the most grammatically correct revision of the underlined portion?

Show answer & explanation

Answer: telescope, which allowed him to observe

Answer

telescope, which allowed him to observe
The correct revision resolves the sentence fragment by replacing the period with a comma. This correctly links the dependent relative clause beginning with 'which' to the main independent clause, creating a grammatically correct, unified sentence.

Step-by-Step Solution

1
Analyze the underlined portion to determine if it is a complete sentence.
The clause 'Which allowed him to observe...' lacks an independent subject and is a dependent clause, making the original construction a sentence fragment.
Identifying sentence fragments requires checking if each punctuated sentence has a subject, a verb, and expresses a complete thought.
2
Evaluate the relationship between the two clauses.
The second clause relative to the first clause is nonessential descriptive information about the telescope.
Determining how the clauses relate helps select the correct punctuation to join them.
3
Select the punctuation that correctly connects the dependent clause to the preceding independent clause.
A comma is the correct punctuation to introduce a nonessential relative clause starting with 'which'.
Connecting the dependent clause to the independent clause with a comma resolves the fragment error without creating a comma splice or semicolon error.

Key Concept

Identifying and correcting sentence fragments by properly connecting dependent clauses to independent clauses.
Question 144Question →

Booming sand dunes emit a low-frequency drone that can last for several minutes. This drone, which is produced when millions of sand grains slide down the dune face in unison; because the friction between the colliding grains creates a synchronized acoustic wave.

Which choice best corrects the underlined portion of the sentence?

Show answer & explanation

Answer: This drone is produced when millions of sand grains slide down the dune face in unison, as

Answer

The correct answer is the option that replaces the underlined text with 'This drone is produced when millions of sand grains slide down the dune face in unison, as'. This choice resolves the fragment by providing the predicate 'is produced' for the main subject 'This drone' and correctly connects the following explanatory dependent clause with a comma and the subordinating conjunction 'as'.
The correct option resolves the sentence fragment by transforming the relative clause into the main verb phrase 'is produced' for the subject 'This drone'. It then uses a comma and the subordinating conjunction 'as' to connect the main clause to the subsequent dependent clause, establishing a grammatically sound cause-and-effect relationship.

Step-by-Step Solution

1
Analyze the structure of the original sentence to find the grammatical error.
The subject 'This drone' is followed by a relative clause ('which is produced...') and a semicolon, but there is no main verb to complete the clause. This results in a sentence fragment.
Every complete sentence must contain at least one independent clause with a subject and a verb.
2
Evaluate the choices to locate an option that supplies a main verb and links the clauses correctly.
The option containing 'is produced' introduces a proper verb for 'This drone'.
This establishes a grammatically complete independent clause.
3
Check the punctuation in the remaining choices to avoid creating new grammatical errors.
Using a semicolon before a dependent clause starting with 'as' is incorrect. Joining two independent clauses with only a comma creates a comma splice. The option using 'as' with a comma is the only grammatically correct choice.
Correct punctuation is required to connect independent and dependent clauses logically.

Key Concept

Sentence Fragments

Alternative Method

Identify the main verb of the second sentence. Because the verb 'creates' belongs to the dependent clause starting with 'because', the subject 'This drone' must have its own active verb. Eliminate options that fail to provide a main verb or that introduce run-on sentences.
Estimated Time:1m 0s
Question 145Question →

Read the sentence below and determine which option best corrects the underlined portion.

By mapping the neural pathways of the zebra finch, the songbird's courtship behavior was shown to rely on a complex network of auditory feedback loops.

Which of the following is the best revision of the underlined portion of the sentence?

Show answer & explanation

Answer: researchers showed that the songbird's courtship behavior relies

Answer

researchers showed that the songbird's courtship behavior relies
The correct answer resolves the dangling modifier by immediately following the introductory phrase 'By mapping the neural pathways of the zebra finch' with a logical subject, 'researchers,' who are capable of performing the mapping. The rest of the clause is grammatically complete and structured correctly.

Step-by-Step Solution

1
Identify the introductory modifier in the sentence.
The phrase 'By mapping the neural pathways of the zebra finch' is a gerund phrase acting as a modifier.
Introductory modifiers must logically describe the subject that immediately follows the comma.
2
Analyze the subject of the main clause in the original sentence.
The subject is 'the songbird's courtship behavior.'
Since courtship behavior cannot map neural pathways, this is a dangling modifier error.
3
Evaluate the choices to find a subject that can logically perform the action of 'mapping.'
The options containing 'researchers' provide a logical subject.
Only human researchers can perform scientific mapping.
4
Check the grammatical structure of the remaining options containing the correct subject.
The option adding 'which' creates a fragment, and the option with a comma splice creates a run-on. The correct option cleanly connects the modifier to the subject and continues with a grammatically sound dependent clause.
A corrected sentence must not introduce new grammatical errors like fragments or comma splices.

Key Concept

Identifying and correcting dangling modifiers by ensuring the introductory modifying phrase has a logical subject immediately following it.
Question 146Question →

Deep-sea hydrothermal vents support unique organisms, recycle crucial nutrients, and they are generating heat through chemical reactions.

Which choice best maintains the parallel structure in the sentence?

Show answer & explanation

Answer: generate

Answer

generate
The correct option maintains parallel structure by using the simple present verb 'generate' to match the other verbs in the series, 'support' and 'recycle.'

Step-by-Step Solution

1
Identify the verbs in the list or series.
The series contains three actions: 'support' (simple present verb), 'recycle' (simple present verb), and the underlined segment.
Parallel structure requires items in a list or series to have the same grammatical form.
2
Analyze the underlined segment 'they are generating'.
This segment uses a pronoun and a progressive verb, which does not match the active, simple present verb forms of 'support' and 'recycle'.
Identifying the mismatch allows us to find the correct parallel grammatical category.
3
Select the option that matches the simple present verb form.
The verb 'generate' is a simple present verb, completing the parallel sequence: 'support,' 'recycle,' and 'generate.'
Using 'generate' ensures grammatical consistency and parallel structure throughout the list.

Key Concept

Parallel Structure in lists requires all items to share the same grammatical form (e.g., all nouns, all infinitives, or all verbs in the same tense).
Question 147Question →

When the eruption of Mount Vesuvius carbonized hundreds of papyrus scrolls in Herculaneum, it preserved them for centuries. Although the scrolls, which are too fragile to unroll, remain unreadable by traditional means. Scientists are now using high-energy X-rays to scan the layers and reconstruct the text digitally.

Which of the following choices best corrects the underlined portion?

Show answer & explanation

Answer: The scrolls, which are too fragile to unroll, remain unreadable by traditional means. Scientists

Answer

The scrolls, which are too fragile to unroll, remain unreadable by traditional means. Scientists
The correct answer removes the subordinating conjunction 'Although', which allows the clause 'The scrolls... remain unreadable by traditional means' to stand alone as a grammatically complete independent sentence. It then properly uses a period to separate this sentence from the subsequent independent sentence.

Step-by-Step Solution

1
Analyze the grammatical structure of the underlined portion in the context of the surrounding sentences.
The clause starting with 'Although' and ending with 'means' contains a subject ('scrolls') and a verb ('remain'), but the subordinating conjunction 'Although' makes it a dependent clause. Punctuating it with a period creates a sentence fragment.
To identify if the original sentence contains a fragment or boundary error.
2
Evaluate choices that keep the subordinating conjunction 'Although'.
The option containing 'NO CHANGE' maintains the fragment. The option using a semicolon before 'scientists' is incorrect because semicolons must only separate two independent clauses.
To eliminate grammatically incorrect options that fail to resolve the dependency of the first clause.
3
Evaluate choices that remove 'Although' and make the first clause independent.
The option ending with ', scientists' results in a comma splice because it joins two independent clauses with only a comma. The option ending with '. Scientists' correctly separates the two independent clauses into two distinct sentences.
To select the option that resolves the fragment without introducing new punctuation errors like comma splices.

Key Concept

Identifying sentence fragments caused by subordinating conjunctions and correcting punctuation boundaries between independent and dependent clauses.
Estimated Time:1m 15s
Question 148Question →

Which form of the verb 'write' correctly completes the sentence to maintain parallel structure?

Fill in the blanks below

The new training program is designed to teach employees how to handle customer complaints, organize files, and weekly reports.
Show answer & explanation

Answer

write
The correct answer is the base verb 'write'. The sentence features a list of three actions following 'how to': 'handle', 'organize', and the blank. Because the first two items are base verbs (bare infinitives), the third item must also be a base verb to maintain a parallel grammatical structure.

Step-by-Step Solution

1
Identify the elements in the series.
The series consists of 'handle customer complaints', 'organize files', and the blank.
To ensure parallel structure, all items in a list or series must share the same grammatical form.
2
Determine the grammatical form of the first two elements.
Both 'handle' and 'organize' are bare infinitives (base verbs) following the helper phrase 'how to'.
Identifying the established pattern shows what form the missing verb must take.
3
Match the grammatical form of the third element to the established pattern.
The verb 'write' must be written in its base form 'write'.
Using the base form completes the list with parallel grammatical structure.

Key Concept

Parallel Structure
Estimated Time:45s
Question 149Question →

Honeybees perform a complex 'waggle dance' to communicate the location of food sources to their hive mates. Although this dance is highly precise. It relies on the angle of the sun to indicate direction.

Which of the following is the most grammatically correct replacement for the underlined portion of the passage?

Show answer & explanation

Answer: Although this dance is highly precise, it

Answer

The correct option is the one that uses a comma to connect the subordinating dependent clause to the main independent clause: 'Although this dance is highly precise, it'.
The correct answer correctly joins the introductory dependent clause ('Although this dance is highly precise') with the main independent clause ('it relies on the angle of the sun') using a comma, establishing a proper subordinate relationship.

Step-by-Step Solution

1
Identify the clause types in the sentence.
The clause 'Although this dance is highly precise' is a dependent clause because it begins with the subordinating conjunction 'Although'. The clause 'it relies on the angle of the sun to indicate direction' is an independent clause.
Determining clause types is necessary to apply the correct punctuation rules for combining clauses.
2
Select the correct punctuation to join the dependent clause and the independent clause.
When a dependent clause starts a sentence, it must be joined to the independent clause with a comma.
A comma avoids creating a sentence fragment (as caused by a period or semicolon) or a comma splice (as caused by removing the subordinating conjunction).

Key Concept

Subordination and Coordination
Question 150Question →

The following passage is an excerpt from an article about the history of technology.

Discovered in a shipwreck off the Greek island of Antikythera in 1901, the Antikythera mechanism has puzzled historians for more than a century. Because it contains dozens of intricate bronze gears that calculated astronomical cycles. This ancient device is now considered the world's oldest analog computer.

Which choice is the best revision of the underlined portion?

Show answer & explanation

Answer: Containing dozens of intricate bronze gears that calculated astronomical cycles, this

Answer

The correct answer is the option that replaces the fragment with a modifying participial phrase followed by a comma and the demonstrative pronoun 'this' ('Containing dozens of intricate bronze gears that calculated astronomical cycles, this').
The correct option replaces the dependent clause fragment with a modifying participial phrase ('Containing dozens of intricate bronze gears that calculated astronomical cycles') and connects it to the independent clause with a comma before the subject ('this'). This successfully integrates the information into a single grammatically correct sentence where the participial phrase modifies 'ancient device'.

Step-by-Step Solution

1
Analyze the underlined portion to determine if it is a complete sentence.
The clause 'Because it contains dozens of intricate bronze gears that calculated astronomical cycles' starts with the subordinating conjunction 'Because' and lacks a main independent clause, which makes it a sentence fragment.
Identifying fragments requires checking if the punctuated unit can stand alone as a complete thought with a subject and a verb.
2
Evaluate the choices to see which option connects the fragment grammatically to the subsequent independent clause.
The option using 'Containing' transforms the fragment into a participial phrase that modifies 'this ancient device' and correctly links it using a comma.
Participial phrases can introduce sentences when separated by a comma from the independent clause they modify.
3
Verify that other options do not introduce new grammatical errors.
The option with the semicolon creates a punctuation error, and the option with 'It contains...' creates a comma splice.
Semicolons must connect two independent clauses, and commas alone cannot join two independent clauses.

Key Concept

A sentence fragment is an incomplete sentence punctuated as if it were a complete one. It often lacks a subject, a verb, or a main independent clause, and can be fixed by linking it to an adjacent independent clause.
Estimated Time:1m 0s
Question 151Question →

The following sentence contains an underlined portion:

The paint formulas of the Dutch Masters, who mixed pigments with linseed oil to achieve a unique translucency, differed significantly from modern artists, who relied on synthetic acrylics.

Which of the following options produces a grammatically correct sentence with a logical comparison?

Show answer & explanation

Answer: those of modern artists, who

Answer

The option containing 'those of modern artists, who' is the correct choice because it uses the plural pronoun 'those' to logically compare 'paint formulas' with the formulas of modern artists and employs the correct relative pronoun and punctuation.
The correct option resolves the illogical comparison by introducing the pronoun 'those' to refer back to the plural noun 'paint formulas.' This correctly aligns the comparison of the Dutch Masters' formulas to those of modern artists. Additionally, it preserves grammatical flow by using a comma and the relative pronoun 'who' to introduce a descriptive dependent clause.

Step-by-Step Solution

1
Identify the two elements being compared in the sentence.
The sentence attempts to compare 'The paint formulas of the Dutch Masters' with 'modern artists'.
To maintain a logical comparison, the sentence must compare similar nouns: formulas to formulas, not formulas to people.
2
Select the correct plural demonstrative pronoun to represent the compared element.
Since 'paint formulas' is a plural noun, the pronoun 'those' must be used ('those of modern artists') to stand in for 'the paint formulas of modern artists'.
This establishes a parallel and logical comparison between the two sets of formulas.
3
Evaluate the punctuation and clause structure of the options.
A comma followed by 'who' correctly introduces a nonessential relative clause modifying 'modern artists', whereas a semicolon before 'who' incorrectly isolates a dependent clause, and using 'they' creates a comma splice.
This ensures the sentence is both logically compared and grammatically punctuated.

Key Concept

Illogical and Incomplete Comparisons
Question 152Question →

Many early aviators relied on visual landmarks to navigate, often getting lost in poor weather conditions. While the invention of the radio compass in the 1920s allowed pilots to fly blind, yet many traditionalists resisted the new technology, preferring to trust their own eyes.

Which choice best coordinates the two clauses to clarify the relationship between the invention of the radio compass and the pilots' reaction?

Show answer & explanation

Answer: The invention of the radio compass in the 1920s allowed pilots to fly blind, but many

Answer

The invention of the radio compass in the 1920s allowed pilots to fly blind, but many
The correct option correctly resolves the double conjunction error in the original sentence by establishing two independent clauses connected by a comma and the coordinating conjunction 'but'. This structure successfully communicates the contrast between the capability of the new technology and the reluctance of traditional pilots to use it.

Step-by-Step Solution

1
Analyze the original sentence structure and identify the relationship between the clauses.
The original sentence contains a subordinating conjunction ('While') at the beginning and a coordinating conjunction ('yet') joining the clauses, which is a double conjunction error.
You cannot use both a subordinating conjunction and a coordinating conjunction to link the same two clauses; one must be removed to establish a grammatically correct relationship.
2
Evaluate the choices for grammatical correctness and correct relationship signaling.
Removing 'While' leaves two independent clauses, which can be correctly joined using the coordinating conjunction 'but' preceded by a comma.
This establishes a clear coordinate relationship of contrast between the clauses without creating a comma splice or sentence fragment.

Key Concept

Subordination and Coordination
Question 153Question →

The ancient city of Petra was carved directly into vibrant red sandstone cliffs. Although it remained unknown to the Western world until the early nineteenth century.

Which of the following is the best revision of the underlined portion?

Show answer & explanation

Answer: , although it remained unknown

Answer

The option that connects the dependent clause to the independent clause using a comma is correct.
The correct option correctly uses a comma to attach the dependent clause starting with 'although' to the preceding independent clause, resolving the fragment and creating a single, grammatically correct sentence.

Step-by-Step Solution

1
Analyze the underlined portion and the sentence structure.
The clause 'Although it remained unknown to the Western world...' starts with a subordinating conjunction and cannot stand alone as a complete sentence.
A dependent clause must be joined to an independent clause to avoid creating a sentence fragment.
2
Select the punctuation that correctly connects the dependent clause to the preceding independent clause.
A comma is the correct punctuation to attach an ending dependent clause to an independent clause.
Using a period or a semicolon isolates the dependent clause, causing a fragment, while removing the subordinating conjunction without a coordinating conjunction creates a comma splice.

Key Concept

Correcting sentence fragments by properly connecting dependent clauses to independent clauses.
Estimated Time:45s
Question 154Question →

During his tenure at the university, the professor not only published several groundbreaking papers on marine biology, but also the department's research funding was doubled by him through private grants. This influx of capital allowed his graduate students to conduct extensive field studies in the Pacific Ocean. Consequently, the university quickly became a leading institution for oceanographic research.

Which of the following options best replaces the bolded portion to maintain a consistent grammatical construction and active voice throughout the sentence?

Show answer & explanation

Answer: doubled the department's research funding

Answer

The option that reads 'doubled the department's research funding' is the correct answer.
The correct option maintains a consistent active voice and parallel structure. The past tense verb 'doubled' perfectly matches the past tense verb 'published' inside the 'not only... but also...' construction, allowing 'the professor' to remain the clear subject for both actions.

Step-by-Step Solution

1
Identify the structure of the sentence containing the bolded portion.
The sentence uses the correlative conjunction structure 'not only... but also...' to join two actions performed by the same subject ('the professor').
Correlative conjunctions must connect grammatically parallel elements to avoid a shift in construction.
2
Analyze the grammatical structure of the first element in the pair.
The first element is 'published several groundbreaking papers...', which uses the active voice and the simple past tense verb 'published'.
This establishes the grammatical pattern that the second element must match.
3
Evaluate the second element to see if there is a shift in construction.
The original phrasing 'the department's research funding was doubled by him' shifts to the passive voice and changes the subject of the clause.
This shift violates parallel structure and creates an awkward, wordy construction.
4
Select the option that maintains active voice, parallel past-tense verbs, and grammatical consistency.
The phrase 'doubled the department's research funding' matches 'published' and keeps 'the professor' as the active performer of both actions.
This restores parallel structure and ensures a clean, direct sentence.

Key Concept

Maintaining parallel structure and avoiding unnecessary shifts in voice or grammatical construction within a sentence.
Question 155Question →

The following passage is adapted from a historical account of scientific discoveries:

In 1856, eighteen-year-old chemist William Henry Perkin attempted to synthesize quinine, a drug used to treat malaria. <u>Although his experiment yielded a dark, sludge-like residue rather than the clear medicine he sought, but he</u> did not discard the mixture. Instead, he investigated the substance's properties and discovered mauveine, the first synthetic dye.

Which option is the most grammatically correct replacement for the underlined portion?

Show answer & explanation

Answer: Although his experiment yielded a dark, sludge-like residue rather than the clear medicine he sought, he

Answer

Although his experiment yielded a dark, sludge-like residue rather than the clear medicine he sought, he
The correct option properly uses the subordinating conjunction 'Although' to introduce a dependent clause ('Although his experiment yielded a dark, sludge-like residue rather than the clear medicine he sought'), which is followed by a comma and a complete independent clause ('he did not discard the mixture'). This structure properly establishes the contrast between the experiment's yield and Perkin's action without grammatical error.

Step-by-Step Solution

1
Analyze the relationship between the two clauses.
The clause describing the experiment's unfavorable result ('yielding a dark residue') contrasts with the chemist's decision ('he did not discard the mixture'), indicating a concessive relationship.
Understanding the logical connection is necessary to choose the correct subordinating or coordinating conjunction.
2
Evaluate the grammar of the original sentence.
The original sentence uses both 'Although' and 'but' together, which is redundant and leaves the sentence without a main independent clause.
A dependent clause starting with a subordinating conjunction cannot be joined to an independent clause using a coordinating conjunction like 'but'.
3
Eliminate options with punctuation or run-on errors.
Using a semicolon to separate the dependent clause starting with 'Although' is incorrect. Removing 'Although' while keeping the comma results in a comma splice between two independent clauses.
Semicolons can only separate independent clauses, and independent clauses cannot be joined by a comma alone.
4
Identify the option that maintains grammatical correctness.
The option that retains 'Although' to subordinate the first clause and uses a comma before the independent clause is selected.
This establishes a correct complex sentence structure with a dependent clause followed by an independent clause.

Key Concept

Subordination and Coordination
Estimated Time:45s
Question 156Question →

In the sentence below, the introductory modifying phrase is underlined. Choose the option that correctly completes the sentence by ensuring the modifier logically describes the correct subject. Type the letter of the correct option (A, B, C, or D) in the blank.

Sentence:
Though designated as a sanctuary for endangered shorebirds, {{blank_1}}.

Options:
A. the environmental agency's new regulations only protected the northern spit of the barrier island
B. the environmental agency only protected the northern spit of the barrier island with new regulations
C. the northern spit of the barrier island was the only area protected by the environmental agency's new regulations
D. protecting the northern spit of the barrier island was the sole focus of the environmental agency's new regulations

Fill in the blanks below

Though designated as a sanctuary for endangered shorebirds, .
Show answer & explanation

Answer

The option stating that 'the northern spit of the barrier island was the only area protected by the environmental agency's new regulations' is correct.
The option beginning with 'the northern spit of the barrier island' is correct because 'the northern spit' is the only noun that can logically be 'designated as a sanctuary for endangered shorebirds', which resolves the dangling modifier.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine what it logically describes.
The introductory phrase is 'Though designated as a sanctuary for endangered shorebirds.' The word 'designated' indicates that the subject of the main clause must be a physical place or habitat that can be designated as a sanctuary.
An introductory participial phrase must modify the subject of the main clause that immediately follows it.
2
Analyze the subject of the main clause in each option to find the one that matches the introductory modifier.
In the option starting with 'the environmental agency's new regulations', the subject is 'regulations'. In the option starting with 'the environmental agency', the subject is 'agency'. In the option starting with 'protecting', the subject is a gerund phrase. In the option starting with 'the northern spit of the barrier island', the subject is 'the northern spit'. Only the spit of the barrier island can be designated as a sanctuary.
A sanctuary is a physical geographic area, not an agency, regulation, or action. Therefore, 'the northern spit of the barrier island' is the only logical subject.
3
Verify that the selected option is grammatically correct and free of other errors.
The sentence 'Though designated as a sanctuary for endangered shorebirds, the northern spit of the barrier island was the only area protected by the environmental agency's new regulations' is grammatically correct and logically clear.
This structure places the correct subject immediately after the comma, resolving the dangling modifier.

Key Concept

Identifying and correcting dangling modifiers by ensuring the introductory phrase modifies the correct logical subject.
Question 157Question →

The acoustic properties of modern concert halls, which are designed with advanced computer modeling, are far more predictable than nineteenth-century halls, they relied on trial-and-error construction methods.

Which of the following options best replaces the underlined portion of the sentence?

Show answer & explanation

Answer: those of nineteenth-century halls, which

Answer

The correct option is the one stating 'those of nineteenth-century halls, which' because it corrects the illogical comparison and uses the relative pronoun 'which' to establish proper sentence structure.
The correct option correctly compares the 'acoustic properties' of modern halls to 'those of' (the acoustic properties of) nineteenth-century halls. Additionally, it uses the relative pronoun 'which' to introduce a dependent clause, maintaining correct sentence structure without a comma splice.

Step-by-Step Solution

1
Identify the elements being compared in the sentence.
The sentence attempts to compare the 'acoustic properties of modern concert halls' with 'nineteenth-century halls.'
To ensure logical comparison, a feature of one entity must be compared to the equivalent feature of the other entity, not to the entity itself.
2
Select a pronoun structure to make the comparison logical.
Use the plural pronoun phrase 'those of' to refer back to the plural noun 'acoustic properties.'
This establishes a parallel and logical comparison between the properties of modern halls and the properties of older halls.
3
Evaluate the grammatical link between the clauses to avoid run-on sentences or fragments.
The relative clause must be introduced with 'which' preceded by a comma.
Using a personal pronoun like 'they' after a comma creates an ungrammatical comma splice, while placing a semicolon before 'which' separates a dependent clause, creating a fragment.

Key Concept

Illogical and Incomplete Comparisons
Question 158Question →

The modern architect focused on both restoring the structural integrity of the historic theater and to modernize its sound system for contemporary performances.

Which choice best maintains the parallel structure of the sentence?

Show answer & explanation

Answer: modernizing

Answer

The correct answer is 'modernizing' because it is a gerund, which matches the grammatical form of the preceding gerund 'restoring' to maintain parallel structure.
The correct answer is 'modernizing' because it is a gerund, which matches the grammatical form of 'restoring' and maintains the parallel structure required by the correlative conjunction 'both... and'.

Step-by-Step Solution

1
Identify the grammatical structure of the sentence and the conjunction connecting the elements.
The sentence uses the correlative conjunction 'both... and' to connect two actions that the architect focused on.
This establishes the relationship between the parts of the sentence that must be parallel.
2
Determine the grammatical form of the first element in the parallel structure.
The first element is 'restoring', which is a gerund phrase.
The second element must match this grammatical form to maintain parallelism.
3
Select the option that matches the gerund form of the first element.
The gerund form is 'modernizing'.
This maintains parallel structure with 'restoring', making the sentence grammatically correct.

Key Concept

Parallel structure with correlative conjunctions requires elements joined by 'both... and' to share the same grammatical form.
Question 159Question →

An urban planner drafts a statement detailing a strategy to reduce municipal carbon emissions. How should the following phrases be sequenced to form a grammatically parallel and logically organized sentence?

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: 'not only by expanding public transit networks,' followed by 'but also by transitioning municipal vehicles to electric power,' and ending with 'and ultimately by upgrading building efficiency standards.'
The correct order establishes a parallel correlative structure ('not only... but also...') followed by a final list element ('and ultimately...'). Each segment uses the parallel prepositional-gerund form ('by expanding...', 'by transitioning...', 'by upgrading...').

Step-by-Step Solution

1
Identify the correlative conjunctions and list elements.
The phrases contain the correlative conjunction pair 'not only' and 'but also', as well as the concluding conjunction 'and ultimately'.
This helps determine the logical sequence of the conjunctions, establishing that 'not only' must precede 'but also', which in turn must precede the final list element 'and ultimately'.
2
Verify the parallel grammatical form of each segment.
Each segment is structured as 'by' + gerund phrase: 'by expanding...', 'by transitioning...', and 'by upgrading...'.
Ensuring that each list item uses the exact same grammatical structure maintains parallel structure throughout the sentence.
3
Assemble the segments in the correct order.
The correct order is 'not only by expanding public transit networks,', 'but also by transitioning municipal vehicles to electric power,', and 'and ultimately by upgrading building efficiency standards.'.
This sequence satisfies both the logical order of the correlative conjunctions and the parallel grammatical structure.

Key Concept

Parallel structure with correlative conjunctions and list elements
Estimated Time:1m 30s
Question 160Question →

The following passage is an excerpt from a linguistics article about unique languages.

Because Basque is a language isolate with no known living relatives, linguists have struggled to determine its origins. Although many scholars who have attempted to link it to various language families, including Iberian and Caucasian.

Which of the following choices represents the best correction for the underlined portion?

Show answer & explanation

Answer: Many scholars have attempted to link it to various language families, including Iberian and Caucasian.

Answer

The correct option removes the subordinating conjunction and relative pronoun to form a complete independent sentence: 'Many scholars have attempted to link it to various language families, including Iberian and Caucasian.'
The correct option removes both the subordinating conjunction 'Although' and the relative pronoun 'who'. This action leaves 'Many scholars' as the main subject and 'have attempted' as the main verb, establishing a complete, independent sentence.

Step-by-Step Solution

1
Analyze the underlined sentence for subject-verb completeness.
The original text contains 'Although' (a subordinating conjunction) and 'who' (a relative pronoun), meaning the clauses are subordinated and there is no main independent verb for the subject 'scholars'. This results in a sentence fragment.
Every sentence must have at least one independent clause containing a subject and a verb that expresses a complete thought.
2
Evaluate the choices to see which one creates a complete, independent sentence without introducing punctuation or run-on errors.
The option beginning with 'Many scholars' removes the subordinating conjunction 'Although' and the relative pronoun 'who', leaving 'scholars' as the subject and 'have attempted' as the main verb, successfully creating an independent clause.
Removing the elements that subordinate the clause turns it into a grammatically correct standalone sentence.
3
Verify that the other choices introduce new grammatical errors.
The option containing a semicolon incorrectly separates a dependent phrase with a semicolon, and the option with 'they have proposed' joins two independent clauses with a comma, causing a comma splice.
Eliminating grammatically flawed options ensures the chosen correction is the only valid choice.

Key Concept

A complete sentence requires a subject and a verb that express an independent, complete thought. Subordinating conjunctions and relative pronouns can turn independent clauses into fragments if they are not attached to a main independent clause.
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Sentence Structure and Formation Practice Questions — ACT — Page 8 | Examkin