Sentence Structure and Formation

444 questions

Question 101Question

A biographer is drafting a sentence to describe the life of a famous sculptor:

"The biography traces the subject's life ________."

To complete the sentence in a chronologically logical sequence while maintaining strict parallel structure, in what order should the following grammatical segments be arranged?

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence of segments is: 'from a childhood of extreme poverty,' followed by 'through a youth of academic dedication,' and concluding with 'to an adulthood of international acclaim.'
The correct sequence arranges the segments chronologically ('childhood' to 'youth' to 'adulthood') and matches them to the prepositional structure 'from... through... to...' to establish a parallel and logical progression.

Step-by-Step Solution

1
Identify the chronological stages of life represented in the segments.
The stages are childhood, youth, and adulthood.
This establishes a logical time progression for the biography description.
2
Align the prepositions that coordinate with these stages to show progression.
The prepositions 'from', 'through', and 'to' must match the stages 'childhood', 'youth', and 'adulthood' respectively.
The prepositional framework 'from... through... to...' idiomatic to show progress aligns with the chronological order.
3
Verify that parallel grammatical structure is maintained across all three segments.
Each segment consists of a preposition, a singular noun for the life stage, the preposition 'of', and an adjective-noun pair describing the stage.
Parallel structure requires that all items in a series share the same grammatical form.

Key Concept

Parallel structure requires that parts of a sentence that are work-sharing or series-based must be expressed in the same grammatical form.
Question 102Question

Architects designing the new community center aimed to minimize energy consumption, incorporate sustainable building materials, and they wanted to maximize natural light in the main atrium.

Which of the following options best maintains a parallel structure in the sentence?

Show answer & explanation

Answer: maximize

Answer

The option 'maximize' correctly completes the sentence by maintaining a parallel list of base form verbs: 'minimize', 'incorporate', and 'maximize'.
The option 'maximize' is correct because it matches the base form verb structure of 'minimize' and 'incorporate', maintaining parallel structure in the list.

Step-by-Step Solution

1
Identify the parallel elements in the sentence.
The sentence lists three goals of the architects: 'minimize', 'incorporate', and the underlined segment.
Recognizing the elements in the series is necessary to analyze their grammatical forms.
2
Determine the grammatical form of the existing elements.
The first two elements are base form verbs ('minimize' and 'incorporate') functioning as infinitives after 'aimed to'.
Parallel structure requires all elements in a list or series to share the same grammatical form.
3
Choose the option that matches the identified form.
The base form verb 'maximize' matches 'minimize' and 'incorporate'.
Selecting 'maximize' maintains grammatical balance and adheres to the rules of parallel structure.

Key Concept

Parallel Structure
Estimated Time:45s
Question 103Question

In the early eighteenth century, Berlin colormaker Johann Jacob Diesbach accidentally synthesized Prussian blue, the first modern synthetic pigment. Because he used a batch of potash contaminated with animal blood.

Which of the following choices best restores grammatical correctness to the underlined portion of the sentence?

Show answer & explanation

Answer: pigment after he used

Answer

The correct option is the one that reads 'pigment after he used', which removes the period and connects the dependent clause to form a single cohesive and grammatically complete sentence.
The correct option properly integrates the dependent clause into the sentence by replacing the period and subordinating conjunction, producing a single grammatically correct sentence with a logical transition.

Step-by-Step Solution

1
Identify the grammatical issue in the original sentence.
The clause starting with 'Because' is a dependent clause, resulting in a sentence fragment when separated by a period.
A dependent clause cannot stand alone as a complete sentence.
2
Evaluate the grammar of the alternative options.
The semicolon option creates a fragment by separating a dependent clause; the comma option creates a comma splice; the option with 'after' connects the clauses correctly.
Appropriate linking words and punctuation are required to join dependent and independent clauses without causing run-ons or fragments.

Key Concept

Identifying and correcting sentence fragments caused by isolated dependent clauses.
Question 104Question

The sentence below describes a series of actions completed by a chef, but it is missing a verb. Which verb correctly completes the sentence to maintain a parallel grammatical structure?

Fill in the blanks below

Yesterday, the chef chopped the vegetables, marinated the chicken, and the sauce.
Show answer & explanation

Answer

A past-tense verb (such as 'simmered', 'prepared', or 'cooked') that matches the past-tense verbs 'chopped' and 'marinated' in the list.
The sentence presents a list of actions completed in the past: 'chopped' and 'marinated'. To maintain parallel structure, the final item in the list must also be a past-tense verb. Verbs like 'simmered', 'cooked', or 'prepared' fit this pattern and keep the grammatical form of the list consistent.

Step-by-Step Solution

1
Analyze the grammatical structure of the existing list items.
The verbs 'chopped' and 'marinated' are both past-tense verbs describing actions completed yesterday.
To maintain parallel structure, all items in a list must share the same grammatical form.
2
Determine the required grammatical form for the missing word.
The missing verb must be in the past tense to align with 'chopped' and 'marinated'.
This maintains tense consistency and parallel structure within the list of actions.

Key Concept

Parallel Structure in lists
Estimated Time:45s
Question 105Question

Urban agriculture projects are becoming increasingly popular in modern cities. Because they provide fresh produce to local neighborhoods.

Which choice best corrects the underlined portion of the sentence?

Show answer & explanation

Answer: ; they provide fresh produce to local neighborhoods.

Answer

; they provide fresh produce to local neighborhoods.
The correct answer properly resolves the sentence fragment by removing the subordinating conjunction 'because' and replacing it with the subject pronoun 'they' to create a complete independent clause. This new independent clause is correctly connected to the preceding independent clause using a semicolon.

Step-by-Step Solution

1
Analyze the underlined portion to determine if it is a complete sentence.
The phrase starts with the subordinating conjunction 'Because', making it a dependent clause rather than an independent clause. It lacks the ability to stand alone, so it is a sentence fragment.
Identifying the grammatical error in the original sentence is the first step to correcting it.
2
Evaluate the answer choices to find a version that resolves the fragment and maintains proper punctuation.
The option containing a semicolon followed by 'they' removes the subordinating conjunction, creating a second independent clause that is correctly connected to the first by a semicolon.
Two independent clauses can be joined by a semicolon to show a close relationship between the ideas.
3
Verify that the other choices do not introduce new grammatical errors.
The choice using a comma creates a comma splice, and the choice using a semicolon before 'because' still leaves a fragment after the semicolon.
Eliminating grammatically incorrect options ensures that the selected answer is correct.

Key Concept

Sentence Fragments
Question 106Question

The molecular structure of synthetic spider silk, which scientists have replicated in laboratory settings, is remarkably similar to wild spiders.

Which choice best corrects the underlined portion to create a logical and grammatically correct comparison?

Show answer & explanation

Answer: that of wild spiders

Answer

The correct answer is the option that replaces the underlined text with 'that of wild spiders' to match the singular noun 'molecular structure' and complete the comparison logically.
The correct response must compare the singular noun 'molecular structure' of synthetic spider silk to the molecular structure of wild spiders. The singular pronoun 'that' logically represents 'molecular structure,' making the comparison grammatically parallel and clear.

Step-by-Step Solution

1
Identify the two elements being compared in the sentence.
The sentence compares 'The molecular structure of synthetic spider silk' with 'wild spiders'.
To determine if a comparison is logical, you must identify what is being compared to what.
2
Evaluate the logic and grammatical parallel of the comparison.
Comparing a 'structure' (thing) to 'spiders' (organisms) is illogical. The comparison should compare the structure of synthetic silk to the structure of wild spider silk.
A logical comparison must compare comparable things (noun-to-noun or attribute-to-attribute).
3
Select the correct singular pronoun to replace the compared attribute and maintain grammatical agreement.
Since 'molecular structure' is singular, use the pronoun 'that' (resulting in 'that of wild spiders') rather than the plural 'those'.
Pronoun reference must match the singular number of the noun it replaces.

Key Concept

Illogical and Incomplete Comparisons
Estimated Time:1m 0s
Question 107Question

In 1896, Swedish scientist Svante Arrhenius proposed that carbon dioxide emissions from burning coal could warm the planet. His calculations were largely ignored for decades, but scientists at the time believed the oceans would absorb any excess carbon dioxide.

Which choice best completes the sentence, establishing a clear and logical relationship between the two clauses?

Show answer & explanation

Answer: His calculations were largely ignored for decades because

Answer

The choice that uses the subordinating conjunction 'because' without punctuation correctly connects the independent clause describing the ignoring of the calculations to the dependent clause explaining the reason why.
The correct answer uses the subordinating conjunction 'because' to establish a clear cause-and-effect relationship between the independent clause and the following dependent clause. Because the dependent clause comes after the main clause, no comma is required before 'because'.

Step-by-Step Solution

1
Analyze the logical relationship between the two clauses.
The first clause ('His calculations were largely ignored for decades') is the effect, and the second clause ('scientists at the time believed...') is the cause. Therefore, a causal relationship needs to be established.
Identifying the logical relationship helps determine whether to use a coordinating conjunction showing contrast or addition, or a subordinating conjunction showing cause.
2
Evaluate the grammar and punctuation of each transition option.
Using 'because' creates a dependent clause that directly follows the main clause without a comma, which is grammatically correct. Using 'but' creates a logical error of contrast. Using a semicolon before 'since' creates a sentence fragment. Omitting any conjunction creates a comma splice.
Ensuring both grammatical correctness and logical coordination/subordination is necessary to choose the correct answer.

Key Concept

Subordination and Coordination
Question 108Question

To become a certified archivist, a candidate must demonstrate proficiency not only in preserving fragile historical documents but also in the organization of digital databases.

Which choice best maintains the parallel structure of the underlined portion in the sentence?

Show answer & explanation

Answer: in organizing digital databases

Answer

The choice 'in organizing digital databases' correctly maintains the parallel structure of the correlative conjunction pair.
The correct option uses the prepositional gerund phrase 'in organizing digital databases'. In the sentence, the correlative conjunction pair 'not only... but also' connects two elements. The first element, which follows 'not only', is a prepositional gerund phrase: 'in preserving fragile historical documents'. To maintain grammatical parallelism, the second element, which follows 'but also', must have the exact same grammatical structure. Thus, 'in organizing' parallelizes perfectly with 'in preserving'.

Step-by-Step Solution

1
Identify the correlative conjunction pair in the sentence.
The correlative pair is 'not only... but also'.
This identifies the structure that requires parallel elements.
2
Analyze the grammatical structure of the element following the first part of the correlative conjunction ('not only').
The phrase is 'in preserving fragile historical documents', which is a prepositional gerund phrase.
This establishes the grammatical pattern that the second element must follow.
3
Evaluate the options to find the one that matches this prepositional gerund phrase structure ('in' + gerund verb + noun phrase).
The phrase 'in organizing digital databases' uses 'in' followed by the gerund 'organizing', which matches the first element.
This ensures grammatical parallelism across the correlative conjunction.

Key Concept

Parallel Structure with Correlative Conjunctions
Estimated Time:1m 0s
Question 109Question

Consider the underlined portion in the passage below:

For decades, scholars attempting to decipher Mayan hieroglyphs struggled to understand the writing system's complex structure, which blended logograms representing whole words with phonetic signs representing individual syllables. Although early researchers believed the glyphs were purely symbolic and lacked any phonetic component. This misconception delayed a complete translation of the texts until the mid-twentieth century.

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

Show answer & explanation

Answer: Early researchers, however, believed the glyphs were purely symbolic and lacked any phonetic component.

Answer

The correct option is 'Early researchers, however, believed the glyphs were purely symbolic and lacked any phonetic component.'
The correct option removes the subordinating conjunction 'Although' and inserts the transitional adverb 'however' set off by commas. This successfully converts the dependent clause fragment into a complete independent sentence with a subject ('Early researchers') and a compound verb ('believed' and 'lacked'), allowing it to stand on its own.

Step-by-Step Solution

1
Analyze the structure of the underlined portion in context.
The underlined section starts with the subordinating conjunction 'Although' and ends with a period, making it a dependent clause standing alone. This constitutes a sentence fragment.
Sentence fragments must be corrected to ensure the passage flows with complete sentences.
2
Evaluate the choices to find one that turns the fragment into a complete independent clause.
Removing the subordinating conjunction 'Although' creates an independent clause. Inserting 'however' set off by commas provides a logical transition from the preceding sentence without creating grammatical errors.
An independent clause must express a complete thought and contain both a subject and a verb.
3
Analyze the remaining distractors for grammatical errors.
One option uses a semicolon inappropriately to set off a dependent phrase, and another option links two independent clauses with a comma, resulting in a comma splice.
Checking all options prevents selecting answers with other sentence structure or punctuation errors.

Key Concept

Identifying and correcting sentence fragments by ensuring every punctuated sentence contains at least one independent clause.
Estimated Time:1m 15s
Question 110Question

The training routine of a professional marathon runner is significantly more intense than a recreational jogger, who typically runs only a few miles a week.

Which of the following choices best completes the sentence so that the comparison is logical and grammatically correct?

Show answer & explanation

Answer: that of a recreational jogger, who

Answer

The correct option is the one that inserts the pronoun 'that of' to compare the runner's training routine to the jogger's training routine, followed by a comma and the relative pronoun 'who'.
The correct option makes the comparison logical by using the singular pronoun 'that' to stand in for 'the training routine,' thereby comparing one routine to another. It also maintains correct punctuation with a comma before the relative clause.

Step-by-Step Solution

1
Identify the two elements being compared in the sentence.
The sentence attempts to compare 'the training routine of a professional marathon runner' with 'a recreational jogger'.
A logical comparison must compare two similar things (a routine to a routine, not a routine to a person).
2
Correct the comparison using a possessive pronoun or phrase.
Use the singular pronoun 'that' (representing 'the training routine') to create the phrase 'that of a recreational jogger'.
This establishes a parallel, logical comparison between the two routines.
3
Evaluate punctuation for the nonessential relative clause that follows.
Keep the comma before the relative pronoun 'who' to correctly introduce the nonessential description.
A semicolon cannot be used here because 'who typically runs only a few miles a week' is a dependent clause and would become a fragment.

Key Concept

Illogical and Incomplete Comparisons
Estimated Time:1m 0s
Question 111Question

Arrange the sentence segments in the correct order to construct a grammatically correct sentence that maintains parallel structure.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence of segments to form a grammatically correct and parallel sentence is: 'The research team's primary objectives were not only to gather baseline soil samples from the volcanic crater, to monitor local seismic patterns using advanced sensors, and to analyze the gas emissions for signs of geothermal activity, but also to publish their findings in a peer-reviewed journal.'
The correct order constructs a coherent sentence where all listed objectives are expressed as parallel infinitive phrases ('to gather', 'to monitor', 'to analyze', and 'to publish'). The correlative conjunction 'not only... but also' is properly balanced, with 'not only' introducing a parallel three-part list of infinitives and 'but also' introducing the final parallel infinitive.

Step-by-Step Solution

1
Identify the independent clause's subject and verb.
The segment starting with 'The research team's primary objectives' acts as the sentence's grammatical foundation.
Every complete sentence requires a subject and a verb to initiate the main clause before listing coordinate or subordinate elements.
2
Determine the placement of the correlative conjunction's first part.
The segment starting with 'not only to gather' must immediately follow the linking verb 'were'.
This establishes the first element of the correlative 'not only... but also' structure and introduces the first infinitive phrase in the parallel series.
3
Order the elements of the internal list in a parallel fashion.
The segment starting with 'to monitor' must follow the first infinitive phrase, and the segment starting with 'and to analyze' must follow it to complete the list of three internal items.
Parallel structure requires that all items in a list share the same grammatical form (infinitives: 'to gather', 'to monitor', 'to analyze') and the coordinating conjunction 'and' must precede the final item in this internal sequence.
4
Complete the correlative structure with the matching conjunction and parallel element.
The segment starting with 'but also to publish' must be placed at the end.
This completes the 'not only... but also' correlative pair with a parallel infinitive ('to publish') and ends the sentence with the terminal period.

Key Concept

Parallel Structure
Question 112Question

Consider the following passage about historical preservation:

In the late twentieth century, scholars attempting to read the Archimedes Palimpsest faced a daunting task: the original mathematical treatises had been scraped away and written over by medieval scribes. Eventually, scientists employed multispectral imaging to expose the hidden text; because the faint traces of the original ink absorbed different wavelengths of light than the parchment. This breakthrough allowed historians to study long-lost works, including the 'Method of Mechanical Theorems'.

Which of the following choices to the underlined portion makes the sentence grammatically correct and logically precise?

Show answer & explanation

Answer: text, because

Answer

The correct answer is the choice that uses a comma to connect the independent clause with the dependent clause starting with 'because'.
The correct answer uses a comma to link the preceding independent clause with the subsequent dependent clause introduced by the subordinating conjunction 'because'. A comma is the appropriate punctuation mark here to connect the clauses and establish the logical causal relationship without introducing grammatical errors.

Step-by-Step Solution

1
Analyze the underlined portion and the surrounding sentence to identify the clauses.
The first part of the sentence ('Eventually, scientists employed multispectral imaging to expose the hidden text') is an independent clause. The second part ('because the faint traces of the original ink absorbed different wavelengths of light than the parchment') is a dependent clause introduced by the subordinating conjunction 'because'.
Understanding the grammatical nature of each clause is necessary to determine the correct punctuation and conjunction to link them.
2
Evaluate the punctuation needed to join these two clauses.
An independent clause and a dependent clause must not be separated by a semicolon, as a semicolon requires independent clauses on both sides. A period would turn the dependent clause into a fragment. Joining them with a comma is the correct way to connect an independent clause to a subsequent dependent clause.
Applying correct rules for subordination prevents sentence fragments and run-on sentences.
3
Select the option that properly joins the independent and dependent clauses.
The option with the comma and 'because' successfully creates a complex sentence, avoiding a semicolon error, a comma splice, or a dependent clause fragment.
This choice ensures the sentence is both grammatically correct and logically coherent.

Key Concept

Subordination and Coordination
Question 113Question

The following passage is about urban planning:

Urban planners must balance a city's historical preservation with its need for modernization. While historic buildings provide a community with character and a sense of identity, they often require expensive retrofitting to meet modern safety codes.

Which choice is the best version of the underlined portion of the sentence?

Show answer & explanation

Answer: NO CHANGE

Answer

The original phrasing is correct because it uses the subordinating conjunction 'While' to create a dependent clause, which is correctly joined to the main independent clause using a comma.
The original sentence correctly pairs the subordinating conjunction 'While' with a conjugated verb ('provide') to form a dependent clause. Since the dependent clause comes first, it is properly separated from the main independent clause by a comma, establishing a logical relationship of contrast.

Step-by-Step Solution

1
Analyze the structure of the two clauses in the sentence.
The first clause ('While historic buildings provide a community with character and a sense of identity') is a dependent clause because it begins with the subordinating conjunction 'While'. The second clause ('they often require expensive retrofitting to meet modern safety codes') is an independent clause.
Understanding clause boundaries helps determine the correct punctuation and conjunctions needed to connect them.
2
Evaluate the grammar and punctuation connecting the clauses.
A dependent clause preceding an independent clause must be separated by a comma, not a semicolon or a coordinating conjunction alone.
Proper subordination rules require a comma when a dependent clause comes first.

Key Concept

Subordination and Coordination
Question 114Question

For centuries, naturalists in temperate forests documented the eerie glow of 'foxfire,' a phenomenon caused by bioluminescent fungi that grow on decaying wood. Although early foresters attributed this light to supernatural forces, believing that the faint green illumination was the work of woodland spirits. Modern mycologists have identified the biochemical reaction responsible for the glow: luciferin, a light-emitting compound, is oxidized in the presence of the enzyme luciferase.

Which choice most effectively corrects the underlined portion to ensure the passage is grammatically complete?

Show answer & explanation

Answer: Early foresters attributed this light to supernatural forces, believing that the faint green illumination was the work of woodland spirits.

Answer

Early foresters attributed this light to supernatural forces, believing that the faint green illumination was the work of woodland spirits.
The correct option removes the subordinating conjunction 'Although' to establish a complete independent clause. This main clause is then grammatically modified by the subsequent participial phrase, forming a complete and correct sentence.

Step-by-Step Solution

1
Analyze the underlined portion to identify if it is a complete sentence.
The sentence begins with the subordinating conjunction 'Although,' which subordinates the main subject-verb pair ('foresters attributed') and turns the entire clause into a dependent clause. Since no independent clause follows in the sentence, it is a fragment.
A complete sentence requires at least one independent clause to express a complete thought.
2
Evaluate the choices to find one that creates an independent clause.
Removing 'Although' changes the first clause into an independent clause ('Early foresters attributed this light to supernatural forces') that can stand alone. The participial modifier 'believing...' is correctly attached using a comma.
Eliminating the subordinating conjunction allows the main clause to function as the independent foundation of the sentence.
3
Verify that other options do not introduce new grammatical errors.
The option with a semicolon creates a fragment because 'believing...' is not independent. The option with 'they believed' creates a comma splice because it connects two independent clauses with only a comma.
Ensuring the selected choice is free of alternative errors like comma splices and semicolon fragments confirms its correctness.

Key Concept

Correcting sentence fragments by identifying subordinating conjunctions that make clauses dependent, and ensuring that every sentence contains at least one independent clause.
Estimated Time:1m 0s
Question 115Question

Complete the sentence by typing the correct form of the parenthesized verb 'publish' to maintain parallel structure.

Fill in the blanks below

The research paper concluded that the success of the project depended on analyzing the local ecology, interviewing the residents, and (publish) the findings in a public forum.
Show answer & explanation

Answer

publishing
The sentence contains a list of three actions: 'analyzing the local ecology', 'interviewing the residents', and the blank. The first two items are gerunds ('analyzing', 'interviewing'). To maintain parallel structure, the third item must also be a gerund. Therefore, the verb 'publish' must be written in its gerund form, 'publishing'.

Step-by-Step Solution

1
Identify the elements of the list in the sentence.
The list consists of three actions that the success of the project depended on: 'analyzing the local ecology', 'interviewing the residents', and the final action starting with the verb 'publish'.
Parallel structure requires that all items in a list or series have the same grammatical form.
2
Determine the grammatical form of the first two items in the list.
The words 'analyzing' and 'interviewing' are both gerunds (verb forms ending in -ing that function as nouns).
Establishing the pattern of the existing list items determines the form the final item must take.
3
Convert the verb 'publish' to match the gerund form of the other list items.
Changing 'publish' to the gerund form yields 'publishing'.
This makes the final element parallel to 'analyzing' and 'interviewing', completing the parallel structure of the sentence.

Key Concept

Parallel structure requires that words, phrases, or clauses in a series or list share the same grammatical form to ensure clarity and balance.
Question 116Question

While researching ancient civilizations, the archaeologists focused on excavating ruins, translating inscriptions, and they wanted to document local pottery.

Which choice most effectively maintains the parallel structure of the sentence?

Show answer & explanation

Answer: documenting

Answer

documenting
The correct option is 'documenting' because it uses the gerund form, which matches the grammatical pattern of the other items in the list ('excavating' and 'translating'). This maintains parallel structure in the sentence.

Step-by-Step Solution

1
Identify the list of items in the sentence.
The list consists of three activities: 'excavating ruins', 'translating inscriptions', and the underlined portion describing the action with 'local pottery'.
Recognizing a list helps determine if parallel structure is required.
2
Analyze the grammatical form of the first two items in the list.
Both 'excavating ruins' and 'translating inscriptions' begin with a gerund (an -ing verb acting as a noun phrase).
To maintain parallel structure, the third item in the list must match this grammatical pattern.
3
Evaluate the choices to find the one that matches this pattern.
The word 'documenting' is a gerund and creates the parallel phrase 'documenting local pottery'.
Choosing 'documenting' ensures all three items in the list are grammatically parallel.

Key Concept

Parallel Structure
Estimated Time:45s
Question 117Question

Deep-sea hydrothermal vents support bizarre ecosystems that thrive in complete darkness. These vents, which spew superheated, mineral-rich water from the ocean floor. They fuel food webs based on chemosynthesis rather than photosynthesis.

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

Show answer & explanation

Answer: These vents spew superheated, mineral-rich water from the ocean floor.

Answer

These vents spew superheated, mineral-rich water from the ocean floor.
The correct option removes the relative pronoun 'which' from the original sentence fragment, transforming it into a complete independent clause with the subject 'These vents' and the verb 'spew'.

Step-by-Step Solution

1
Analyze the underlined portion to identify if it is a complete sentence or a fragment.
The original text 'These vents, which spew superheated, mineral-rich water from the ocean floor.' is a fragment because the subject 'These vents' is followed by a relative clause starting with 'which' and lacks a main verb to complete the thought.
Identifying the grammatical structure helps determine what correction is needed to make a complete sentence.
2
Evaluate the choices to find one that creates a complete independent sentence with a subject and a verb.
Removing the relative pronoun 'which' leaves 'These vents spew...', which has a subject ('These vents') and a finite verb ('spew'), making it a grammatically correct independent sentence.
A complete sentence requires both a subject and a main verb to express a complete thought.

Key Concept

Sentence Fragments
Estimated Time:45s
Question 118Question

For decades, astrophysicists have debated the overall geometry of the cosmos. Although the standard cosmological model suggests that the universe is flat; however, researchers continue to test alternative models because even a tiny degree of curvature would fundamentally alter our calculations regarding its ultimate fate.

Which choice best completes the sentence, establishing a clear and grammatically correct relationship between the ideas?

Show answer & explanation

Answer: Although the standard cosmological model suggests that the universe is flat, researchers continue to test

Answer

The option that correctly subordinates the first clause using 'Although' followed by a comma to introduce the main clause: 'Although the standard cosmological model suggests that the universe is flat, researchers continue to test'.
The correct option correctly uses the subordinating conjunction 'Although' to set up a dependent clause, which is separated from the independent main clause by a comma. This avoids coordination conflict and punctuation errors.

Step-by-Step Solution

1
Identify the structure of the two clauses in the sentence.
The first clause is 'Although the standard cosmological model suggests that the universe is flat' and the second is 'researchers continue to test alternative models...'
To determine whether subordination, coordination, or both are appropriate.
2
Analyze the logical relationship between the two clauses.
The relationship is one of contrast (the standard theory says it is flat, but researchers still test alternative models).
To choose the correct transition or conjunction.
3
Evaluate the options for grammatical correctness and punctuation.
The original text uses both 'Although' and 'however' with a semicolon, which is redundant and incorrectly punctuated. The option using 'however' with a comma is a comma splice. The option using 'Although' and 'but' creates a double conjunction. The option using 'Although' with a comma correctly subordinates the first clause.
To eliminate grammatically incorrect options and select the correct one.

Key Concept

Subordination and Coordination
Question 119Question

The chemical composition of interstellar dust in the Orion Nebula, which contains complex organic molecules, is far more difficult to analyze than a typical comet in our solar system.

Which choice best corrects the underlined portion of the sentence?

Show answer & explanation

Answer: that of a typical comet in our solar system.

Answer

The correct answer is the option that replaces the underlined text with 'that of a typical comet in our solar system.' This corrects the illogical comparison by comparing the chemical composition of the dust to the chemical composition of a comet, rather than comparing a composition directly to a comet.
The correct option correctly uses the pronoun phrase 'that of' to refer back to the singular noun phrase 'the chemical composition'. This establishes a logical, parallel comparison between the chemical composition of interstellar dust and the chemical composition of a typical comet. Without this pronoun phrase, the sentence illogically compares a chemical composition to a physical comet.

Step-by-Step Solution

1
Identify the two elements being compared in the sentence.
The first element is 'The chemical composition of interstellar dust', and the second element is 'a typical comet'.
To ensure a comparison is logical, the two items being compared must be of the same type.
2
Analyze if the comparison is logical.
Comparing a 'chemical composition' (an abstract property) to a 'comet' (a physical celestial body) is illogical.
A property must be compared to another property, or a celestial body to another celestial body.
3
Find a choice that makes the comparison logical and grammatically correct.
The phrase 'that of a typical comet' uses the pronoun 'that' to represent 'the chemical composition', making the comparison logical.
This creates a parallel comparison: the chemical composition of interstellar dust is compared to the chemical composition of a typical comet.

Key Concept

Illogical comparisons occur when a sentence compares two things that are not of the same type or cannot be logically compared. In English, singular nouns are compared using the pronoun 'that of' and plural nouns using 'those of' to maintain parallel structure and clarity.
Question 120Question

For decades, the migration patterns of the monarch butterfly baffled entomologists. Although researchers knew the insects traveled thousands of miles south each autumn, how they navigated to the exact same high-altitude forests in Mexico remained unclear. Modern studies reveal that monarchs use a solar compass, which adjusts for the time of day, and their descent is guided by magnetic cues.

Which of the following alternatives to the underlined portion is most grammatically correct and consistent with the tone and structure of the sentence?

Show answer & explanation

Answer: and rely on magnetic cues to guide their descent.

Answer

and rely on magnetic cues to guide their descent.
The correct option maintains the active voice and parallel structure established in the first clause. By coordinating the present-tense verb 'rely' with 'use', the sentence maintains 'monarchs' as the single subject of both actions and avoids any shift in construction.

Step-by-Step Solution

1
Identify the subject and voice of the first main clause in the coordinate sentence.
The subject is 'monarchs' and the verb 'use' is active.
Establishing the initial structure of the sentence determines the parallel pattern that should follow.
2
Analyze the underlined portion for shifts in construction relative to the first clause.
The underlined portion shifts to a passive verb form ('is guided') and changes the grammatical subject to 'their descent'.
Identifying this shift reveals the error in construction and parallelism that needs correction.
3
Evaluate the choices to find the one that maintains consistency in both voice and subject.
The option containing 'rely on magnetic cues' maintains the active voice and allows 'monarchs' to remain the implied subject of the coordinate verb.
A coordinate predicate using the active-voice verb 'rely' perfectly parallels 'use', avoiding any awkward shifts in construction.

Key Concept

Shifts in Construction
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Sentence Structure and Formation Practice Questions — ACT — Page 6 | Examkin