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Sentence Structure and Formation

444 questions

All types444Multiple choice368Ordering15Fill in the blank61
Question 361Question →

While hiking through the dense canopy of the Ecuadorian rainforest, a rare orchid was discovered by the botanist that had never been documented before.

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

Show answer & explanation

Answer: the botanist discovered a rare orchid that had never been documented before.

Answer

the botanist discovered a rare orchid that had never been documented before.
The correct answer resolves the dangling modifier by placing the logical subject immediately after the introductory phrase. This makes it clear that the botanist was the one hiking, and it forms a grammatically correct, complete sentence.

Step-by-Step Solution

1
Identify the logical subject of the introductory modifying phrase.
The phrase 'While hiking through the dense canopy...' describes an action that must be performed by a person, which in this context is the botanist.
An introductory modifier must logically describe the subject that immediately follows the comma to avoid a dangling modifier.
2
Evaluate the options to find the one that places the logical subject immediately after the comma and forms a complete sentence without errors.
The option beginning with 'the botanist discovered' correctly associates the action with the subject and forms a complete independent clause.
The correct option must resolve the modifier error while maintaining correct punctuation and clause structure.

Key Concept

Misplaced and Dangling Modifiers
Question 362Question →

To ensure that the introductory phrase modifies the correct subject, which of the two phrases—'the conservation team' or 'the Renaissance fresco'—should be placed in the blank to complete the sentence?

Fill in the blanks below

Having spent decades hidden beneath layers of plaster and soot, was meticulously restored.
Show answer & explanation

Answer

The Renaissance fresco
The introductory participial phrase 'Having spent decades hidden beneath layers of plaster and soot' must modify the noun that immediately follows it. Since a fresco can be hidden under plaster and soot, placing 'the Renaissance fresco' immediately after the comma creates a logical and grammatically correct sentence.

Step-by-Step Solution

1
Analyze the introductory modifying phrase 'Having spent decades hidden beneath layers of plaster and soot' to determine what it logically describes.
The phrase describes an object that has been covered in plaster and soot for decades.
This identifies the logical subject that the modifier must describe.
2
Evaluate the two choices ('the conservation team' and 'the Renaissance fresco') to see which one fits this description.
A fresco (a type of mural painting) can be hidden under plaster, while a conservation team cannot.
Placing the correct logical subject immediately after the comma resolves the dangling modifier.

Key Concept

An introductory modifier must be placed adjacent to the noun or pronoun it logically modifies.
Estimated Time:1m 0s
Question 363Question →

Early sound recordings were captured on fragile wax cylinders, which are highly susceptible to mold and physical wear. To preserve these auditory artifacts, archivists now use non-contact optical scanning technology. This method reconstructs the audio from high-resolution images of the groove profiles, consequently, the sound can be played back digitally without any physical needle ever touching the delicate wax.

Which of the following choices best replaces the underlined portion to correct the grammatical error?

Show answer & explanation

Answer: profiles; consequently, the sound

Answer

The correct option is 'profiles; consequently, the sound' because it correctly uses a semicolon to separate the two independent clauses, followed by a comma after the transitional word 'consequently'.
The correct option properly separates the two independent clauses using a semicolon, followed by a comma after the transitional adverb 'consequently'. This resolves the comma splice error of the original sentence while maintaining grammatical completeness.

Step-by-Step Solution

1
Identify the structure of the clauses flanking the transition.
The clause before 'consequently' ('This method reconstructs the audio from high-resolution images of the groove profiles') and the clause after ('the sound can be played back digitally without any physical needle ever touching the delicate wax') are both independent clauses.
Knowing whether the clauses are independent or dependent determines the required punctuation.
2
Select the correct punctuation to join the two independent clauses.
A semicolon is required to separate the two independent clauses when joined by the conjunctive adverb 'consequently', which must be followed by a comma.
Using a comma alone to join two independent clauses creates a comma splice, while inserting 'because' turns the second clause into a dependent clause, creating a fragment.

Key Concept

Joining two independent clauses with a conjunctive adverb requires a semicolon before the adverb and a comma after it to prevent a run-on or comma splice.
Estimated Time:1m 0s
Question 364Question →

Read the following passage. Which form of the verb 'detect' correctly completes the sentence without introducing an inconsistent shift in verb tense?

Fill in the blanks below

While the deep-sea submersible descended into the Mariana Trench, its sensors recorded the rising water pressure and changes in temperature. These measurements provided scientists with crucial data about the extreme environment. By studying these variables, researchers can better understand deep-ocean currents.
Show answer & explanation

Answer

detected
The past-tense verb 'detected' is correct because it maintains a consistent past tense and active voice structure, aligning perfectly with 'recorded'.

Step-by-Step Solution

1
Identify the tense of the main verb in the coordinate clause.
The main verb 'recorded' is in the simple past tense.
To maintain a consistent grammatical construction, verbs in parallel structure must share the same tense.
2
Conjugate the verb 'detect' to match the past tense of 'recorded'.
The past tense form of 'detect' is 'detected'.
Using 'detected' maintains the active voice and past tense established by 'recorded'.

Key Concept

Shifts in Construction
Question 365Question →

The following passage is an excerpt from an article about modern materials science.

Materials scientists are developing smart fabrics that can monitor a wearer's vital signs and adjust insulation in response to temperature changes. While early prototypes were bulky and required external battery packs, newer iterations embed flexible sensors directly into the threads, nonetheless, challenges remain regarding the durability of these garments after multiple wash cycles.

Which of the following choices best replaces the underlined portion to make the sentence grammatically correct?

Show answer & explanation

Answer: ; nonetheless, challenges remain regarding

Answer

The correct answer is the option that uses a semicolon to separate the two independent clauses: '; nonetheless, challenges remain regarding'.
The correct answer uses a semicolon to separate two independent clauses. The clause preceding the punctuation is independent, and the clause following ('challenges remain regarding...') is also independent. The transition 'nonetheless' is correctly introduced by a semicolon and followed by a comma.

Step-by-Step Solution

1
Identify the clause structures before and after the underlined transition.
The first part of the sentence contains a complete independent clause: 'While early prototypes were bulky and required external battery packs, newer iterations embed flexible sensors directly into the threads.' The second part is also an independent clause: 'challenges remain regarding the durability of these garments after multiple wash cycles.'
Understanding clause boundaries helps determine whether the punctuation should separate independent or dependent thoughts.
2
Evaluate the grammatical rules for connecting independent clauses.
Two independent clauses cannot be joined by a comma and a conjunctive adverb like 'nonetheless' alone; this creates a comma splice. A semicolon, period, or coordinating conjunction is required.
Correcting comma splices requires choosing a punctuation mark that can legally separate independent clauses.
3
Select the option that correctly separates the clauses without creating new errors.
The option using a semicolon before 'nonetheless' and a comma after it creates a grammatically correct transition between the two independent clauses.
A semicolon is the appropriate choice to link closely related independent clauses when a conjunctive adverb is used.

Key Concept

Run-on Sentences and Comma Splices
Question 366Question →

The following passage contains an underlined portion.

Although the amateur astronomer spent hours calibrating the telescope, she still struggles to locate the faint nebula. She consulted several star charts, adjusted the focus, and finally spotted the celestial object. This experience taught her the value of patience in observational astronomy.

Which choice best replaces the underlined word to maintain a consistent verb tense throughout the passage?

Show answer & explanation

Answer: struggled

Answer

struggled
The correct option is the past tense verb 'struggled' because it maintains a consistent verb tense with the other past tense verbs in the passage, such as 'spent,' 'consulted,' 'adjusted,' 'spotted,' and 'taught.' The passage describes a series of completed actions in the past, so the simple past tense is required to avoid an illogical shift in tense.

Step-by-Step Solution

1
Identify the verbs surrounding the underlined word in the passage to establish the narrative's timeframe.
The verbs 'spent,' 'consulted,' 'adjusted,' 'spotted,' and 'taught' are all in the simple past tense.
Establishing the primary tense of the passage is necessary to ensure consistency and avoid inappropriate shifts in construction.
2
Analyze the underlined word 'struggles' in relation to the established past tense context.
The verb 'struggles' is in the present tense, which creates an inconsistent and grammatically incorrect shift in tense.
Identifying tense mismatch helps pinpoint the error that needs correction.
3
Select the option that corrects this shift by matching the simple past tense of the other verbs.
The simple past tense verb 'struggled' resolves the shift and maintains grammatical consistency throughout the passage.
Choosing the grammatically consistent past tense verb completes the correction.

Key Concept

Avoiding Inconsistent Shifts in Verb Tense
Question 367Question →

In the sentence below, the underlined portion may contain an error.

Restored using delicate Japanese tissue paper, the archivist preserved the map's fragile parchment for future display.

Which choice best corrects the underlined portion of the sentence?

Show answer & explanation

Answer: the map's fragile parchment was preserved by the archivist

Answer

the map's fragile parchment was preserved by the archivist
The introductory phrase 'Restored using delicate Japanese tissue paper' describes an action performed on the parchment, not the archivist. To correct this dangling modifier, the subject immediately following the comma must be the noun that is modified, which is 'the map's fragile parchment'. The choice stating 'the map's fragile parchment was preserved by the archivist' properly places the correct subject after the modifier and maintains a grammatically complete and clear sentence.

Step-by-Step Solution

1
Identify the introductory phrase and determine what it logically describes.
The phrase 'Restored using delicate Japanese tissue paper' describes an object that can be physically restored, which is the map's fragile parchment.
An introductory modifying phrase must logically describe the subject of the clause that immediately follows it.
2
Evaluate the options to find the one where the correct subject follows the comma without introducing new grammatical errors.
The choice starting with 'the map's fragile parchment' correctly aligns the modifier and forms a complete passive-voice sentence.
Aligning the modifier with its correct target resolves the dangling modifier error.

Key Concept

An introductory participial phrase must modify the subject of the independent clause that immediately follows it. If the subject of the clause is not the entity described by the introductory phrase, the modifier is dangling.
Estimated Time:1m 0s
Question 368Question →

To ensure the introductory phrase 'By heating and cooling the cocoa butter crystals to precise temperatures' modifies the correct subject, complete the sentence by filling in the blank with the appropriate noun phrase: either 'the chocolatier' or 'a glossy finish'.

Fill in the blanks below

By heating and cooling the cocoa butter crystals to precise temperatures, achieved a glossy finish and a clean snap on the dark chocolate bars.
Show answer & explanation

Answer

the chocolatier
The introductory phrase 'By heating and cooling the cocoa butter crystals to precise temperatures' describes an action. According to grammar rules, the noun immediately following the comma must be the logical subject performing that action. A person, such as the chocolatier, can perform this action, whereas a result, such as a glossy finish, cannot. Therefore, filling the blank with the chocolatier corrects the dangling modifier.

Step-by-Step Solution

1
Identify the introductory modifying phrase and the action it describes.
The introductory phrase is 'By heating and cooling the cocoa butter crystals to precise temperatures', which describes the action of temperature manipulation.
An introductory modifying phrase must logically describe the subject that immediately follows the comma.
2
Evaluate the two proposed subjects ('the chocolatier' and 'a glossy finish') to determine which one can logically perform the action.
The chocolatier is the active agent performing the heating and cooling, whereas a glossy finish is an inanimate result of the tempering process.
Placing 'a glossy finish' after the comma would create a dangling modifier, as a finish cannot heat or cool crystals.

Key Concept

Misplaced and Dangling Modifiers
Question 369Question →

Read the passage below. Fill in the blank with the correct form of the verb in parentheses to maintain a consistent grammatical construction and avoid an inappropriate shift in verb tense.

Fill in the blanks below

While the geologists conducted their field research, they gathered core samples from the valley. They analyzed the mineral composition of the rocks, and they (document) the geothermal activity in the region.
Show answer & explanation

Answer

documented
The correct answer is 'documented'. The passage describes a series of completed actions in the past ('conducted', 'gathered', 'analyzed'). To maintain a consistent construction, the final verb in the sequence must also be in the simple past tense.

Step-by-Step Solution

1
Identify the tense of the verbs established in the surrounding context of the passage.
The verbs 'conducted', 'gathered', and 'analyzed' are all in the simple past tense.
Establishing the timeframe of the passage is necessary to ensure grammatical consistency throughout the narrative.
2
Conjugate the parenthetical verb 'document' to match the established simple past tense.
The simple past tense form of 'document' is 'documented'.
Using the same tense avoids an inappropriate verb tense shift and completes the parallel construction of completed actions.

Key Concept

Maintaining verb tense consistency within a passage to avoid illogical shifts in construction.
Question 370Question →

Ancient Roman concrete is renowned for its durability, allowing structures like the Pantheon to remain standing for nearly two thousand years. Unlike modern concrete, which begins to degrade within decades, the Roman mixture contains volcanic ash, this unique ingredient undergoes a chemical reaction with seawater that crystallizes and strengthens the material over time. Because of this self-healing process, the concrete actually grows stronger when exposed to the elements.

Which of the following choices represents the best revision of the underlined portion?

Show answer & explanation

Answer: ash; this unique ingredient

Answer

The correct choice is the option that replaces the comma with a semicolon to separate the two independent clauses: 'ash; this unique ingredient'.
The correct choice uses a semicolon to separate two independent clauses: 'the Roman mixture contains volcanic ash' and 'this unique ingredient undergoes a chemical reaction with seawater.' Since both clauses can stand alone as complete sentences, they must be separated by a semicolon, a period, or a comma with a coordinating conjunction.

Step-by-Step Solution

1
Identify the boundary between the two clauses in the sentence.
The first clause is 'Unlike modern concrete, which begins to degrade within decades, the Roman mixture contains volcanic ash,' and the second clause is 'this unique ingredient undergoes a chemical reaction with seawater...'
This helps determine if both clauses are independent and if the punctuation between them is correct.
2
Evaluate the grammatical relationship between the two clauses.
Both clauses contain a subject and a verb and can stand alone as complete thoughts, making them independent clauses.
Two independent clauses cannot be joined by a comma alone; doing so creates a comma splice.
3
Check the answer options to find the correct punctuation that resolves the comma splice.
The correct revision uses a semicolon to separate the two independent clauses, while the other options either retain the comma splice or create dependent clause fragments.
A semicolon is a standard grammatical way to connect two closely related independent clauses.

Key Concept

Run-on Sentences and Comma Splices
Estimated Time:1m 0s
Question 371Question →

After marinating in a mixture of soy sauce and ginger for several hours, the chef grilled the salmon fillet to perfection.

Which of the following versions of the underlined portion represents the most grammatically correct and logical sentence?

Show answer & explanation

Answer: the salmon fillet was grilled to perfection by the chef

Answer

The correct option is the one stating 'the salmon fillet was grilled to perfection by the chef'.
The correct option is the one stating 'the salmon fillet was grilled to perfection by the chef'. The introductory phrase 'After marinating in a mixture of soy sauce and ginger for several hours' describes the salmon fillet. Placing the salmon fillet immediately after the comma resolves the dangling modifier and creates a logically clear sentence.

Step-by-Step Solution

1
Analyze the introductory modifying phrase to determine what it describes.
The phrase 'After marinating in a mixture of soy sauce and ginger for several hours' must logically describe the salmon fillet rather than the chef.
Modifiers must be placed as close as possible to the noun they modify to ensure logical clarity.
2
Check the subject of the main clause directly following the comma.
The original sentence has 'the chef' as the subject, which creates a dangling modifier. The subject needs to be 'the salmon fillet'.
An introductory modifier describes the subject that immediately follows the comma.
3
Evaluate the choices to find the one that correctly places the modified noun first without introducing other grammatical errors.
The option that changes the main clause to start with 'the salmon fillet' is correct, whereas other options create fragments or comma splices.
This revision produces a grammatically sound and logically coherent passive construction.

Key Concept

Misplaced and Dangling Modifiers
Estimated Time:1m 0s
Question 372Question →

The following sentence contains a modifier error in the underlined portion: 'By analyzing the chemical composition of the core sample, the age of the glacier was determined by the scientists.' To correct this error, what phrase should replace the underlined portion to ensure the sentence is grammatically correct?

Fill in the blanks below

By analyzing the chemical composition of the core sample, .
Show answer & explanation

Answer

the scientists determined the age of the glacier
The correct answer provides the logical agent performing the action described in the introductory modifying phrase. Since 'the scientists' are the ones analyzing the core sample, they must serve as the subject immediately following the comma, expressed in the active voice.

Step-by-Step Solution

1
Identify the introductory modifying phrase and the action it describes.
The phrase 'By analyzing the chemical composition of the core sample' describes the action of performing an analysis.
An introductory modifying phrase must immediately precede the noun or pronoun that performs the action described.
2
Identify the logical subject of the action.
The ones performing the analysis are the scientists, not 'the age of the glacier'.
A dangling modifier is created when the subject following the comma cannot logically perform the action in the modifier.
3
Restructure the sentence to place the logical subject immediately after the modifier and change the passive construction to active voice.
The phrase 'the scientists determined the age of the glacier' correctly places the active subject next to the modifier.
This establishes clear, logical syntax and eliminates the dangling modifier.

Key Concept

A modifying phrase must be adjacent to the noun it logically modifies. For introductory participial or prepositional phrases, the logical subject must immediately follow the comma.
Estimated Time:1m 0s
Question 373Question →

During the construction of the Brooklyn Bridge, workers faced dangerous conditions high above the East River. Many of these laborers braved strong winds daily, and low wages were accepted by them to support their families. Ultimately, their dedication helped complete one of the greatest engineering feats of the nineteenth century.

Which choice best maintains a consistent grammatical construction in this sentence?

Show answer & explanation

Answer: accepted low wages

Answer

The correct choice is 'accepted low wages'.
The correct choice maintains the active voice and simple past tense established in the first part of the sentence. By using the verb 'accepted', it parallels 'braved' and keeps the grammatical subject as the laborers, ensuring consistency in construction.

Step-by-Step Solution

1
Analyze the grammatical structure of the first clause.
The first clause ('Many of these laborers braved...') is in the active voice and uses the simple past tense.
Establishing the initial grammatical pattern is necessary to ensure the second clause maintains construction consistency.
2
Evaluate the underlined portion to check for any grammatical shifts.
The original phrasing ('low wages were accepted by them') shifts to the passive voice and changes the grammatical subject from 'laborers' to 'wages'.
Identifying shifts in voice or subject helps target the construction error.
3
Compare the choices to select the one that maintains parallel active voice and past tense.
The choice 'accepted low wages' uses the active past-tense verb 'accepted' to parallel 'braved', maintaining 'laborers' as the subject.
This maintains consistency in voice and subject, correcting the shift in construction.

Key Concept

Shifts in Construction
Question 374Question →

While foraging for food in the subzero temperatures of the tundra, the thick fur of the arctic fox protects it from frostbite.

Which of the following options best resolves the grammatical error in the underlined portion of the sentence?

Show answer & explanation

Answer: the arctic fox relies on its thick fur for protection

Answer

the arctic fox relies on its thick fur for protection
The correct option replaces the underlined portion with a clause whose subject is 'the arctic fox'. This resolves the dangling modifier because 'the arctic fox' is the logical subject performing the action of 'foraging' in the introductory phrase.

Step-by-Step Solution

1
Identify the introductory phrase and the action it describes.
The introductory phrase is 'While foraging for food in the subzero temperatures of the tundra,' which describes the action of foraging.
Introductory modifier phrases must be followed immediately by the noun they logically describe.
2
Determine the logical subject of this action and check the options.
An arctic fox can forage, but its 'thick fur' cannot. Therefore, the main clause must begin with 'the arctic fox' to prevent a dangling modifier.
Matching the introductory modifier with the correct subject ensures grammatical clarity and logical sentence structure.
3
Evaluate the grammatical correctness of the remaining options starting with the correct subject.
The choice ending with 'it protects the animal' creates a comma splice, whereas the choice starting with 'the arctic fox relies on its thick fur for protection' forms a complete, grammatically correct sentence.
The correct choice must not only resolve the modifier error but also avoid introducing new errors such as comma splices or fragments.

Key Concept

Misplaced and Dangling Modifiers
Question 375Question →

The following passage is an excerpt from an article about behavioral psychology.

The spotlight effect is a psychological phenomenon in which people tend to believe they are being noticed more than they actually are. During social interactions, individuals often overestimate the prominence of their mistakes or appearance, they assume that everyone's attention is focused on them. In reality, most people are focused on their own anxieties and pay very little attention to the minor flaws of others.

Which of the following options is the best replacement for the underlined portion to ensure the sentence is grammatically correct?

Show answer & explanation

Answer: appearance; they assume that everyone's attention is focused on them

Answer

The correct option is 'appearance; they assume that everyone's attention is focused on them' because it uses a semicolon to correctly separate two independent clauses, resolving the comma splice error.
The correct option resolves the comma splice by replacing the comma with a semicolon. A semicolon is the appropriate punctuation mark to join two independent clauses ('During social interactions, individuals often overestimate the prominence of their mistakes or appearance' and 'they assume that everyone's attention is focused on them') without a coordinating conjunction.

Step-by-Step Solution

1
Analyze the structure of the original sentence to identify the clause types.
The sentence consists of two independent clauses: 'During social interactions, individuals often overestimate the prominence of their mistakes or appearance' and 'they assume that everyone's attention is focused on them'.
Identifying the clause boundaries and types is necessary to determine the correct punctuation and conjunction requirements.
2
Evaluate the relationship and punctuation between the two clauses.
The clauses are joined by only a comma, which creates a comma splice.
Two independent clauses cannot be joined by a comma alone; they require a semicolon, a period, or a comma with a coordinating conjunction.
3
Compare the options to find the one that correctly resolves the comma splice without creating new errors.
The option using a semicolon to separate the two independent clauses is grammatically correct, whereas the others either retain the comma splice, create a fragment, or introduce incorrect comma placement.
A semicolon is a standard and grammatically correct way to join two closely related independent clauses.

Key Concept

Connecting Independent Clauses and Avoiding Comma Splices
Question 376Question →

Read the sentence below. Fill in the blank with the correct form of the verb 'record' to maintain a consistent verb tense and parallel structure, avoiding a shift in construction.

Fill in the blanks below

During the archaeological dig, the researchers uncovered ancient pottery, cataloged the artifacts, and their findings in a database.
Show answer & explanation

Answer

recorded
The correct answer is 'recorded' because it maintains a consistent simple past tense and parallel verb structure with the other verbs in the series, 'uncovered' and 'cataloged'. This avoids a shift in construction.

Step-by-Step Solution

1
Analyze the sentence to identify the parallel structure of actions performed by the researchers.
The sentence lists three actions: 'uncovered', 'cataloged', and the action represented by the verb 'record'.
Identifying the list helps determine if there is a pattern in verb tense and form that must be maintained.
2
Identify the tense and voice of the existing verbs in the list.
The verbs 'uncovered' and 'cataloged' are both in the simple past tense and active voice.
To avoid an illogical shift in construction and maintain parallel structure, all items in a list of actions must share the same grammatical form.
3
Conjugate the base verb 'record' to match the simple past tense of the other verbs.
The simple past tense of 'record' is 'recorded'.
Using 'recorded' avoids a tense shift and ensures the sentence is grammatically correct and consistent.

Key Concept

Avoiding shifts in construction by maintaining consistent verb tense and parallel structure in a series.
Question 377Question →

Many modern architects are turning to cross-laminated timber as a sustainable alternative to steel and concrete. This engineered wood is exceptionally strong, moreover, it traps carbon dioxide rather than releasing it during production. By utilizing this material, builders can significantly reduce the carbon footprint of new high-rises.

Which of the following options best corrects the underlined portion of the passage?

Show answer & explanation

Answer: strong; moreover, it

Answer

strong; moreover, it
The correct option correctly resolves the comma splice by placing a semicolon after the first independent clause, followed by the transitional adverb 'moreover' and a comma, which is the standard punctuation pattern for linking two independent clauses with a conjunctive adverb.

Step-by-Step Solution

1
Identify the structure of the clauses surrounding the underlined portion.
The clause before the underline ('This engineered wood is exceptionally strong') and the clause after ('it traps carbon dioxide rather than releasing it during production') are both independent clauses.
Determining whether the clauses are independent or dependent guides the selection of appropriate punctuation and conjunctions.
2
Evaluate the grammatical relationship and transition between the two independent clauses.
Joining two independent clauses with a comma and a transitional adverb like 'moreover' creates a comma splice. A semicolon is required before the transitional adverb, followed by a comma after it, to correctly link the two complete thoughts.
A semicolon is grammatically necessary to separate two independent clauses when no coordinating conjunction (like 'and' or 'but') is used.

Key Concept

Joining independent clauses using semicolons and transitional adverbs
Estimated Time:1m 0s
Question 378Question →

To correct the dangling modifier in the sentence below, the introductory phrase must modify the logical subject. Fill in the blank with an appropriate noun (such as 'oceanographer' or 'submarine') that represents the entity that performed the action of descending.

Fill in the blanks below

Having descended to the bottom of the Mariana Trench, the recorded several previously unknown species using external cameras.
Show answer & explanation

Answer

To correct the dangling modifier, the blank must be filled with a logical subject that is capable of descending, such as 'oceanographer' or 'submarine', rather than an inanimate object like 'cameras' or 'recording'.
The correct answer must be a noun that represents the entity performing the action in the introductory phrase. Since an oceanographer, scientist, or submarine can logically descend to the bottom of the Mariana Trench, inserting one of these terms as the subject of the main clause ensures grammatical alignment and eliminates the dangling modifier.

Step-by-Step Solution

1
Identify the action described in the introductory participial phrase.
The action is 'descending to the bottom of the Mariana Trench.'
An introductory participial phrase must modify the subject of the main clause that immediately follows it.
2
Identify a logical subject that can perform this action.
The external cameras cannot descend on their own; it must be a vessel (like a submarine) or a person (like an oceanographer).
Placing a noun representing the descending entity as the subject of the main clause resolves the dangling modifier.

Key Concept

A dangling modifier occurs when an introductory modifying phrase does not logically describe the subject of the main clause. To correct this error, the subject of the main clause must be the entity performing the action described in the modifier.
Estimated Time:1m 0s
Question 379Question →

To write a successful grant proposal, a scientist must state the research goals clearly, provide a detailed budget, and a realistic timeline should be outlined. This thorough preparation increases the likelihood of securing funding. Ultimately, a well-crafted proposal convinces reviewers of the project's viability. Which choice best completes the sentence while maintaining a consistent grammatical construction?

Show answer & explanation

Answer: outline a realistic timeline

Answer

outline a realistic timeline
The correct answer maintains the parallel structure established earlier in the sentence. The sentence lists three tasks a scientist must perform, starting each with a base-form verb: 'state' and 'provide.' The phrase 'outline a realistic timeline' continues this active-voice pattern, ensuring grammatical consistency.

Step-by-Step Solution

1
Identify the grammatical structure of the initial list items in the sentence.
The first two items, 'state the research goals clearly' and 'provide a detailed budget,' are active-voice verb phrases that rely on the base form of the verbs following the modal auxiliary 'must'.
Establishing the existing pattern is necessary to ensure the final item in the series follows the same grammatical structure.
2
Examine the underlined portion for shifts in construction.
The underlined phrase 'a realistic timeline should be outlined' shifts to a passive voice clause, which breaks the active-voice verb list pattern.
Identifying this shift helps isolate the grammatical error in the original sentence.
3
Evaluate the choices to find the phrase that maintains the active base-verb structure.
The phrase 'outline a realistic timeline' uses the base verb form to parallel the actions of stating goals and providing a budget.
Choosing this option resolves the shift in construction and completes the list with grammatical consistency.

Key Concept

Shifts in Construction
Question 380Question →

During the late nineteenth century, the expansion of the transcontinental railroad transformed the American West, it allowed goods to be shipped across the country in days rather than months. Consequently, remote towns grew into bustling economic hubs almost overnight, attracting merchants and laborers alike. This rapid industrialization, however, also brought significant environmental challenges to the region.

Which of the following choices best corrects the underlined portion?

Show answer & explanation

Answer: transformed the American West, allowing

Answer

The choice that reads 'transformed the American West, allowing' correctly resolves the comma splice by converting the second clause into a modifying participial phrase.
The correct option resolves the comma splice by replacing the independent clause 'it allowed' with the participial phrase 'allowing'. This structure grammatically modifies the main clause without creating a fragment or a run-on sentence.

Step-by-Step Solution

1
Identify the grammatical error in the original sentence.
The original sentence contains a comma splice because the independent clause 'the expansion of the transcontinental railroad transformed the American West' is joined to another independent clause 'it allowed goods...' with only a comma.
Determining the existing error is necessary to choose the appropriate correction.
2
Evaluate the choices to find which one corrects the comma splice without creating a fragment.
Changing the second clause into a participial phrase beginning with 'allowing' correctly modifies the main clause and eliminates the run-on structure.
This resolves the punctuation and clause connection error while maintaining grammatical correctness.

Key Concept

Identifying and correcting run-on sentences and comma splices by modifying clause structure or punctuation.
Estimated Time:1m 0s
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Sentence Structure and Formation Practice Questions — ACT — Page 19 | Examkin