Examkin

Sentence Structure and Formation

444 questions

All types444Multiple choice368Ordering15Fill in the blank61
Question 341Question →

In the mid-twentieth century, mathematician Gladys West programmed early computers to analyze satellite measurements. She worked with extreme precision; because she aimed to calculate an accurate model of the Earth's shape, which later became the foundation for GPS technology.

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

Show answer & explanation

Answer: She worked with extreme precision because she aimed to

Answer

She worked with extreme precision because she aimed to
The correct answer ('She worked with extreme precision because she aimed to') properly joins the independent clause with the dependent clause using the subordinating conjunction 'because' without any punctuation, avoiding fragments and comma splices.

Step-by-Step Solution

1
Analyze the structure of the clauses in the original sentence.
The sentence contains two main ideas: 'She worked with extreme precision' (independent clause) and 'she aimed to calculate...' (dependent clause introducing a reason).
Understanding clause boundaries is essential for choosing the correct punctuation and conjunctions.
2
Evaluate the punctuation and conjunction linking these clauses.
The subordinating conjunction 'because' makes the second clause dependent. A semicolon cannot be used to separate an independent clause from a dependent clause, so the original construction is incorrect.
Semicolons can only connect two closely related independent clauses.
3
Select the choice that establishes the correct relationship between the clauses without punctuation errors.
The choice that removes the semicolon and joins the clauses directly with 'because' creates a grammatically correct complex sentence.
An independent clause followed by a dependent clause starting with 'because' does not require a comma or semicolon between them.

Key Concept

Subordination and Coordination
Question 342Question →

To protect their nests from predators, leafcutter ants carry freshly cut leaves underground to cultivate a specialized fungus. Which serves as the colony's primary food source.

Which choice best corrects the underlined portion of the sentence?

Show answer & explanation

Answer: fungus, which serves as

Answer

fungus, which serves as
The correct option is 'fungus, which serves as' because it resolves the fragment by using a comma to attach the non-essential relative clause to the independent clause that precedes it.

Step-by-Step Solution

1
Analyze the underlined portion and the surrounding context.
The text after the period, 'Which serves as the colony's primary food source', lacks an independent subject-verb relationship and is a relative clause.
Relative clauses beginning with relative pronouns like 'which' are dependent clauses and cannot stand alone as sentences.
2
Evaluate the choices to find one that correctly connects this dependent clause to the main clause.
The option containing 'fungus, which serves as' uses a comma to attach the non-essential relative clause directly to the noun it modifies, 'fungus'.
This establishes a grammatically complete sentence with an independent clause followed by a dependent relative clause.
3
Verify that the other choices are grammatically incorrect.
The option containing a semicolon creates a fragment because semicolons cannot separate dependent clauses. The option containing 'this fungus serves as' creates a comma splice by joining two independent clauses with only a comma.
Ensuring all distractors violate distinct grammar rules confirms the validity of the chosen correct option.

Key Concept

Identifying and correcting sentence fragments by properly connecting dependent relative clauses to independent clauses.
Question 343Question →

Read the sentence below. To maintain a consistent grammatical construction and avoid an incorrect shift in verb tense, which form of the verb 'freeze' should be written in the blank?

Fill in the blanks below

After the botanist gathered several rare specimens from the rainforest canopy, she them in her laboratory to preserve their delicate structures.
Show answer & explanation

Answer

froze
The verb 'gathered' in the first clause establishes a past-time frame. To maintain consistency and avoid an incorrect shift in verb tense, the second action in the sequence must also be in the past tense. The correct past-tense form of 'freeze' is 'froze'.

Step-by-Step Solution

1
Analyze the timeframe of the first clause in the sentence.
The verb 'gathered' is in the past tense, establishing that the actions in the sentence occurred in the past.
Establishing the initial verb tense is necessary to determine the required tense for subsequent verbs in the same sequence.
2
Determine if there is a shift in timeframe between the two actions.
Both the gathering of specimens and the freezing of specimens occurred in the past as part of a single sequence of events, meaning no timeframe shift is warranted.
Verbs in a sentence must remain in the same tense unless there is a clear, logical reason for a shift in time.
3
Conjugate the verb 'freeze' to match the established past tense.
The past-tense form of the irregular verb 'freeze' is 'froze'.
Writing 'froze' in the blank maintains tense consistency and avoids an incorrect shift in construction.

Key Concept

Shifts in Construction: Verb Tense Consistency
Question 344Question →

After descending thousands of feet into the ocean's abyssal zone, the scientists' remote camera captured a previously unknown species of bioluminescent jellyfish.

Which of the following choices, if substituted for the underlined portion, makes the sentence grammatically correct?

Show answer & explanation

Answer: the scientists used a remote camera to capture

Answer

the scientists used a remote camera to capture
The correct answer resolves the dangling modifier by placing the logical subject—the scientists—directly after the introductory phrase. This makes it clear that the scientists, not the camera, were the ones descending into the ocean depths.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine what or who it logically describes.
The phrase 'After descending thousands of feet into the ocean's abyssal zone' describes a conscious action of exploration, which must be performed by the scientists rather than their camera.
To prevent a dangling modifier, the subject immediately following the comma must be the entity performing the action in the introductory phrase.
2
Evaluate the options to find the one that places 'the scientists' immediately after the comma without introducing new grammatical errors.
The option stating 'the scientists used a remote camera to capture' correctly positions 'the scientists' as the subject and maintains a complete, grammatically sound sentence.
This phrasing resolves the modifier issue and avoids fragments, comma splices, or other structural errors.

Key Concept

Misplaced and Dangling Modifiers
Question 345Question →

Although electric eels are famous for their ability to generate strong electrical discharges, they use these pulses primarily for navigation. In the murky waters of the Amazon Basin, an eel emits weak electrical signals to scan its surroundings. After these signals bounced off nearby objects, the eel's specialized receptors detect the returning current to map the environment.

Which choice most effectively maintains a consistent grammatical construction and tense throughout the sentence?

Show answer & explanation

Answer: After these signals bounce off nearby objects, the eel's specialized receptors detect

Answer

The correct option is the one that uses the present tense verb 'bounce' ('After these signals bounce off nearby objects, the eel's specialized receptors detect'), maintaining consistency with the present tense of the rest of the passage.
The correct option maintains a consistent present tense throughout the paragraph. Because the passage describes standard scientific facts about the electric eel using present tense verbs ('are,' 'use,' and 'emits'), the subordinate clause in the final sentence must also use the present tense verb 'bounce' to match the main verb 'detect.'

Step-by-Step Solution

1
Analyze the verb tenses in the surrounding sentences to establish the narrative timeline.
The verbs 'are' (present), 'use' (present), and 'emits' (present) establish that the passage is written in the present tense to describe scientific facts.
Verb tenses must remain consistent throughout a passage unless there is a logical reason to shift timeframes.
2
Evaluate the underlined verb tense relative to the main verb of the sentence.
The underlined subordinate clause uses 'bounced' (past tense), while the main verb is 'detect' (present tense). This is an inconsistent shift.
Both verbs describe a simultaneous, recurring process and should share the same present tense.
3
Identify the option that corrects this tense shift without introducing new grammatical errors.
The choice using 'bounce' provides the correct present tense. The option starting with 'Bouncing' introduces a dangling modifier, and the option with 'had bounced' and 'will detect' introduces confusing tense changes.
Only the correct option maintains both verb tense consistency and logical modifier placement.

Key Concept

Shifts in Construction (Verb Tense Consistency)
Estimated Time:1m 0s
Question 346Question →

The following passage contains a blank. Which form of the verb 'document' should fill the blank to maintain a consistent grammatical construction and avoid an inappropriate shift in verb tense?

Fill in the blanks below

Last summer, the conservation team surveyed the nesting sites of green sea turtles along the coast. While the researchers counted the eggs, the project director the temperature of the surrounding sand.
Show answer & explanation

Answer

documented
The verb 'documented' is in the simple past tense, which matches the simple past tense verbs 'surveyed' and 'counted' used elsewhere in the passage to describe the researchers' past actions. This maintains grammatical consistency and avoids an unnecessary shift in construction.

Step-by-Step Solution

1
Analyze the verbs in the surrounding context to determine the primary tense of the passage.
The verbs 'surveyed' and 'counted' are in the simple past tense, establishing that the passage describes past events.
Maintaining tense consistency prevents abrupt and illogical shifts in construction.
2
Determine the relationship between the events to identify the correct tense for the blank.
The action of recording the temperature occurred at the same time as the counting of the eggs, meaning it should also be in the simple past tense.
Since the actions are concurrent, shifting to the present or future tense is unnecessary and grammatically inconsistent.
3
Conjugate the verb 'document' to the simple past tense.
The simple past tense of 'document' is 'documented'.
This is the correct grammatical form to complete the sentence.

Key Concept

Shifts in Construction
Question 347Question →

In the following sentence, the introductory phrase is a dangling modifier because it does not logically modify the subject of the main clause:

"While examining the fossilized dinosaur egg under a microscope, tiny fractures in the shell were noticed by the researcher."

To correct this error, the sentence must be revised so that the subject of the main clause is the person performing the action of examining. Fill in the blank to complete the corrected sentence using the correct noun phrase from the original sentence.

Fill in the blanks below

While examining the fossilized dinosaur egg under a microscope, noticed tiny fractures in the shell.
Show answer & explanation

Answer

the researcher
The introductory phrase describes the act of examining a dinosaur egg under a microscope. The logical subject who performs this action is the researcher. Therefore, the main clause must begin with 'the researcher' to ensure the modifier correctly describes the subject.

Step-by-Step Solution

1
Identify the introductory modifying phrase and the action it describes.
The phrase is 'While examining the fossilized dinosaur egg under a microscope,' which describes the action of examining.
To correct a dangling modifier, you must determine who or what logically performs the action described by the modifier.
2
Identify the logical subject from the rest of the sentence.
The original sentence states 'tiny fractures... were noticed by the researcher.' The researcher is the entity performing the action of examining.
Tiny fractures cannot look through a microscope; only a person (the researcher) can do this.
3
Place the logical subject immediately after the comma to serve as the subject of the main clause.
The corrected main clause starts with 'the researcher' as the subject, followed by the active verb 'noticed'.
This establishes a logical relationship between the introductory modifier and the subject of the sentence, correcting the dangling modifier.

Key Concept

A dangling modifier occurs when the noun or pronoun being modified is either missing or incorrectly identified in the sentence. When a sentence begins with an introductory participial or prepositional phrase, the noun that immediately follows the comma must be the logical subject performing the action of that phrase.
Question 348Question →

After reading the author's personal diaries, the inspiration behind the famous gothic novel was finally understood by the literature students.

Which of the following choices represents the most grammatically correct version of the underlined portion of the sentence?

Show answer & explanation

Answer: the literature students finally understood the inspiration behind the famous gothic novel.

Answer

the literature students finally understood the inspiration behind the famous gothic novel.
The correct option resolves the dangling modifier by placing the logical subject—the literature students, who are the ones reading the diaries—immediately after the introductory phrase. This establishes a clear, logical relationship between the modifier and the noun it modifies.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine what it modifies.
The phrase 'After reading the author's personal diaries' describes an action. The person or group performing this action must be the subject that immediately follows the comma.
An introductory participial or prepositional phrase must logically modify the subject of the main clause to avoid a dangling modifier.
2
Evaluate the choices to find which subject logically performs the action of reading the diaries.
The literature students are the ones who can read the diaries, so 'the literature students' must be the subject of the main clause.
Placing 'the literature students' immediately after the comma resolves the dangling modifier and creates a grammatically correct sentence.

Key Concept

Misplaced and Dangling Modifiers
Question 349Question →

In 1938, a South African museum curator named Marjorie Courtenay-Latimer encountered an unusual blue fish among a local trawler's catch. Recognizing the specimen as something extraordinary, even though she could not immediately identify it. She contacted J.L.B. Smith, a local chemistry professor and amateur ichthyologist, to help classify the creature.

Which choice most effectively corrects the underlined portion to form a grammatically complete sentence?

Show answer & explanation

Answer: She recognized the specimen as something extraordinary. Although she could not immediately identify it, she

Answer

The choice that begins 'She recognized the specimen...' correctly creates two separate, complete sentences.
The correct choice successfully resolves the fragment by creating two distinct, grammatically complete sentences. The first sentence is an independent clause ('She recognized the specimen as something extraordinary.') containing a clear subject and verb. The second sentence properly joins an introductory dependent clause ('Although she could not immediately identify it') to the main independent clause using a comma.

Step-by-Step Solution

1
Analyze the structure of the underlined portion and the surrounding text.
The first group of words ('Recognizing the specimen... identify it.') is separated by a period but lacks a subject and a main verb, making it a sentence fragment.
Identifying sentence boundaries and fragments is the first step in solving structure questions.
2
Evaluate the choices to see which option establishes an independent clause for both sentence parts.
Changing the first part to 'She recognized the specimen...' introduces a subject ('She') and a main verb ('recognized'), establishing a complete independent clause.
A complete sentence requires at least one independent clause containing a subject and a verb.
3
Check the punctuation and conjunctions in the second sentence part to avoid comma splices or run-ons.
The second part ('Although she could not immediately identify it, she contacted...') correctly links a dependent clause to an independent clause using a comma.
Ensures the correct option does not introduce new structural or punctuation errors.

Key Concept

Sentence Fragments
Estimated Time:1m 0s
Question 350Question →

To prepare a gourmet meal, the chef selected fresh organic vegetables, simmered the broth for several hours, and the steaks were grilled over an open flame. This careful attention to detail ensured that every component of the dish was cooked to perfection. The guests thoroughly enjoyed the dining experience and praised the chef's expertise.

Which of the following choices best maintains a consistent grammatical construction in the first sentence?

Show answer & explanation

Answer: grilled the steaks

Answer

grilled the steaks
The correct answer maintains parallel construction in the sentence. The first two actions in the list ('selected' and 'simmered') are written as active-voice, simple past tense verbs that share the subject 'the chef'. By using the simple past tense active verb 'grilled', the list remains consistent and grammatically parallel.

Step-by-Step Solution

1
Analyze the structure of the first sentence and identify the parallel series of actions.
The sentence describes three actions performed by the subject 'the chef': 'selected fresh organic vegetables', 'simmered the broth', and a final action.
Identifying the structure helps determine if there is an inconsistent shift in voice, subject, or tense.
2
Evaluate the grammatical voice and tense of the first two items in the series.
Both 'selected' and 'simmered' are active voice, simple past tense verbs that share the subject 'the chef'.
Consistent sentence construction requires that the final item in a list matches the grammatical pattern of the preceding items.
3
Select the option that maintains this active voice, simple past tense construction.
'grilled the steaks' is in the active voice and simple past tense, making it parallel to 'selected' and 'simmered'.
This revision eliminates the shift to passive voice and the shift in subject, maintaining grammatical consistency.

Key Concept

Parallel Structure and Voice Consistency in Lists
Estimated Time:1m 0s
Question 351Question →

Complete the passage by filling in the blank with the correct form of the verb 'adjust' to maintain a consistent construction and avoid an inappropriate shift in tense or voice.

Fill in the blanks below

When the curation team organized the museum's new wing, they cataloged the artifacts, arranged the display cases, and the lighting system to highlight the main exhibits.
Show answer & explanation

Answer

adjusted
The sentence describes a list of completed actions in the past: 'cataloged,' 'arranged,' and the missing action. To maintain consistency in verb tense and voice, the blank must be filled with the simple past tense active form of the verb, which is 'adjusted.'

Step-by-Step Solution

1
Analyze the sentence structure and locate the parallel elements.
The sentence contains a coordinate list of actions performed by the curation team: 'cataloged the artifacts' and 'arranged the display cases'.
Identifying parallel elements helps determine the required verb tense, voice, and aspect to maintain consistency.
2
Identify the tense and voice of the existing verbs in the sequence.
The verbs 'cataloged' and 'arranged' are both in the simple past tense and active voice.
To avoid an inappropriate shift in construction, the third verb in the sequence must also be in the simple past tense and active voice.
3
Conjugate the verb 'adjust' to match the established pattern.
The simple past tense, active voice form of 'adjust' is 'adjusted'.
This maintains grammatical consistency and parallel construction throughout the sentence.

Key Concept

Shifts in Construction (Verb Tense and Voice Consistency)
Question 352Question →

Though recorded in a single afternoon, jazz enthusiasts still view Miles Davis's masterpiece *Kind of Blue* as a landmark achievement.

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

Show answer & explanation

Answer: Miles Davis's masterpiece *Kind of Blue* is still viewed by jazz enthusiasts as a landmark achievement.

Answer

The corrected sentence must place the album immediately after the introductory modifier as the subject of the clause, forming a grammatically complete and correct sentence: 'Though recorded in a single afternoon, Miles Davis's masterpiece *Kind of Blue* is still viewed by jazz enthusiasts as a landmark achievement.'
The introductory phrase 'Though recorded in a single afternoon' describes an album. To avoid a dangling modifier, the noun immediately following the comma must be the album itself. The option beginning with 'Miles Davis's masterpiece *Kind of Blue*' correctly aligns the modifier with its logical subject in a grammatically complete sentence.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine what it describes.
The phrase 'Though recorded in a single afternoon' must describe an album, not people.
Introductory phrases must logically modify the noun that immediately follows them.
2
Evaluate the subject of the main clause in the options to find one that aligns with this modifier.
The album 'Miles Davis's masterpiece *Kind of Blue*' must be the subject immediately following the comma.
This placement resolves the dangling modifier.
3
Check the remaining options for other grammatical errors, such as fragments or comma splices.
Eliminate options that introduce fragments or comma splices, leaving the grammatically sound passive-voice correction.
Correct grammar requires both logical modifier placement and proper clause structure.

Key Concept

Introductory modifiers must be placed immediately adjacent to the noun they logically describe to avoid dangling modifier errors.
Question 353Question →

Read the passage below and select the phrase that best replaces the underlined portion to correct the sentence structure and modifier placement. Which of the phrases from the options list correctly completes the sentence to avoid a modifier error?

Options to choose from:
- NO CHANGE (which leaves 'a hidden cache of gold coins was discovered by the archaeologists')
- the archaeologists discovered a hidden cache of gold coins
- the archaeologists discovering a hidden cache of gold coins
- the archaeologists discovered a hidden cache of gold coins, they were excited

Fill in the blanks below

While excavating the subterranean chambers of the ancient Roman villa, a hidden cache of gold coins was discovered by the archaeologists.

Corrected phrase:
Show answer & explanation

Answer

the archaeologists discovered a hidden cache of gold coins
The correct answer resolves the dangling modifier by placing the logical subject, 'the archaeologists,' immediately after the introductory clause. This ensures that the introductory phrase 'While excavating the subterranean chambers of the ancient Roman villa' correctly modifies the entity performing the action.

Step-by-Step Solution

1
Identify the introductory modifying phrase in the sentence.
The introductory phrase is 'While excavating the subterranean chambers of the ancient Roman villa,' which is a participial modifier.
This phrase describes an action that must be performed by a logical subject immediately following the comma.
2
Determine the logical subject of the action in the modifier.
The entity doing the excavating must be 'the archaeologists.'
An inanimate object like 'a hidden cache of gold coins' cannot excavate a villa.
3
Select the option that places the logical subject immediately after the comma and forms a complete, grammatically correct sentence.
The phrase 'the archaeologists discovered a hidden cache of gold coins' provides the correct subject and a complete main clause.
This eliminates the dangling modifier without creating a fragment or a comma splice.

Key Concept

Misplaced and Dangling Modifiers
Estimated Time:1m 0s
Question 354Question →

Art conservators have recently turned to particle accelerators to analyze fragile paintings without damaging them. By bombarding a canvas with high-energy X-rays, researchers can map the distribution of chemical elements in the pigment layers, consequently, this process reveals hidden drawings and structural changes made by the original artist. This non-invasive technology allows museums to study centuries-old masterpieces with unprecedented detail.

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

Show answer & explanation

Answer: layers; consequently, this process reveals

Answer

layers; consequently, this process reveals
The correct answer is the option that reads 'layers; consequently, this process reveals'. This choice correctly joins the two independent clauses using a semicolon before the conjunctive adverb 'consequently' and a comma after it, which is the standard punctuation rule for joining independent clauses with transitional adverbs.

Step-by-Step Solution

1
Analyze the structure of the clauses surrounding the underlined portion.
The clause before the underlined portion ('By bombarding... pigment layers') is independent, and the clause after ('this process reveals... original artist') is also independent.
Identifying clause types determines what punctuation and conjunctions are grammatically required to join them.
2
Evaluate the grammatical legality of the transition word and punctuation.
The word 'consequently' is a conjunctive adverb. Joining two independent clauses with only a comma and a conjunctive adverb is a comma splice, so a semicolon or period is required.
Conjunctive adverbs cannot join independent clauses without proper strong punctuation (a semicolon or period).
3
Verify that the chosen punctuation does not create fragments.
Using a semicolon with a complete independent clause ('this process reveals...') is correct, whereas introducing a participle like 'revealing' or a subordinating conjunction like 'Because' creates a fragment.
The corrected sentence must maintain two complete, grammatically sound clauses.

Key Concept

Joining Independent Clauses with Conjunctive Adverbs
Question 355Question →

In the early days of aviation, pilots relied heavily on visual landmarks and basic compasses to navigate. Because they lacked modern radar systems, these early aviators regularly scanned the horizon, watched for changes in the weather, and they are adjusting their flight paths accordingly. These careful observations were critical to ensuring a safe arrival at their destinations.

Which choice best maintains a consistent grammatical construction in the underlined portion of the sentence?

Show answer & explanation

Answer: adjusted

Answer

adjusted
The correct answer maintains parallel structure by using the simple past-tense verb 'adjusted' to match the other past-tense verbs in the series, 'scanned' and 'watched.'

Step-by-Step Solution

1
Analyze the structure of the sentence containing the underlined portion.
The sentence lists a series of three actions performed by the subject: scanning the horizon, watching for changes in the weather, and the underlined action.
Identifying the list structure helps determine if there is a parallel list requiring consistent construction.
2
Identify the grammatical form of the first two items in the series.
The verbs 'scanned' and 'watched' are both simple past-tense verbs.
All items in a coordinating list must share the same grammatical form to maintain parallel structure.
3
Evaluate the choices to find the one that matches this simple past-tense verb form.
The option 'adjusted' is a simple past-tense verb, which fits the pattern 'scanned... watched... and adjusted.'
Selecting a simple past-tense verb completes the series with grammatical consistency and avoids any shift in construction.

Key Concept

Parallel Structure and Verb Tense Consistency in Lists
Question 356Question →

Fill in the blank with the correct form of the verb *analyze* to maintain a consistent grammatical construction and avoid an inappropriate shift in verb tense.

Fill in the blanks below

While conducting research on urban heat islands, the meteorologist recorded temperature changes across the city, mapped the density of concrete structures, and data from satellite imagery.
Show answer & explanation

Answer

analyzed (or analysed)
The correct answer is 'analyzed' (or 'analysed') because it is the simple past tense form of the verb, which matches the simple past tense verbs 'recorded' and 'mapped' in the list. This maintains parallel structure and avoids an inappropriate shift in verb tense.

Step-by-Step Solution

1
Identify the structure and main verbs of the sentence.
The sentence describes a list of three actions completed by the meteorologist: 'recorded temperature changes', 'mapped the density', and the blank action regarding 'data from satellite imagery'.
Understanding the sentence structure helps identify if there is a parallel list requiring consistent verb tense and form.
2
Analyze the tense of the existing verbs in the parallel construction.
The verbs 'recorded' and 'mapped' are both in the simple past tense.
To maintain parallel structure and avoid an inappropriate shift in construction, the third verb in the series must match the simple past tense form.
3
Conjugate the verb *analyze* to match the simple past tense.
The simple past tense of *analyze* is *analyzed* (or *analysed* in British English).
Using the past tense form completes the parallel structure consistently.

Key Concept

Shifts in Construction
Question 357Question →

Aeroponics is a soil-free cultivation method that suspends plant roots in the air, where they are periodically misted with nutrient-rich water. By eliminating the need for soil or growing media, this technique drastically reduces water consumption while accelerating plant growth. Traditional farming, however, remains more cost-effective for large-scale grains, urban vertical farms are increasingly adopting aeroponics for high-value leafy greens.

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

Show answer & explanation

Answer: grains; urban vertical farms

Answer

The correct option is the one that replaces the comma with a semicolon: 'grains; urban vertical farms'.
The option replacing the comma with a semicolon is correct because a semicolon is a standard punctuation mark used to separate two independent clauses. Both the clause before the punctuation and the clause after it are complete thoughts that can stand alone as sentences, so a semicolon resolves the comma splice without introducing any additional errors.

Step-by-Step Solution

1
Analyze the two clauses surrounding the underlined portion.
Both 'Traditional farming, however, remains more cost-effective for large-scale grains' and 'urban vertical farms are increasingly adopting aeroponics for high-value leafy greens' are independent clauses.
To determine the appropriate punctuation or conjunction, we must first identify if the clauses are independent or dependent.
2
Evaluate the punctuation in the original passage.
The original passage joins these two independent clauses with only a comma.
Joining two independent clauses with only a comma creates a grammatical error known as a comma splice.
3
Select the option that correctly separates or joins the independent clauses without creating new errors.
Using a semicolon alone correctly separates the two independent clauses, whereas options that introduce subordinating conjunctions ('because' or 'Although') incorrectly create fragments.
A semicolon is grammatically required to separate two closely related independent clauses when no coordinating conjunction is present.

Key Concept

Run-on Sentences and Comma Splices
Question 358Question →

The following passage contains an underlined portion.

Mycorrhizal fungi establish vast underground networks, they link the roots of different plants to facilitate nutrient exchange. Through these fungal threads, trees can share carbon, water, and warning signals about pests; therefore, the network acts as a primitive communication system. This mutualistic relationship, which is vital for forest health, sustains entire ecosystems.

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

Show answer & explanation

Answer: networks, which link

Answer

The correct answer is the option that changes the underlined portion to 'networks, which link'.
The correct option resolves the comma splice by converting the second independent clause into a dependent relative clause using a comma followed by the relative pronoun 'which'. This correctly describes 'networks' while maintaining proper sentence structure.

Step-by-Step Solution

1
Analyze the original sentence structure to identify any errors.
The original sentence contains two independent clauses joined by only a comma: 'Mycorrhizal fungi establish vast underground networks' and 'they link the roots of different plants to facilitate nutrient exchange'. This is a comma splice.
Identifying the error helps determine the appropriate grammatical fix.
2
Evaluate the choices to find the correct punctuation and structure.
Changing the underlined portion to 'networks, which link' converts the second independent clause into a dependent relative clause. This correctly modifies 'networks' and resolves the comma splice.
The correct choice must join the clauses grammatically without creating fragments or other run-ons.

Key Concept

Run-on Sentences and Comma Splices
Estimated Time:1m 0s
Question 359Question →

To avoid a dangling modifier, complete the sentence by filling in the blank with either the pronoun 'I' or the noun phrase 'the telescope' to establish a logical subject for the introductory phrase:

Fill in the blanks below

To obtain a clearer view of the distant nebula, adjusted the focal length of the telescope.
Show answer & explanation

Answer

I
The pronoun 'I' is correct because it provides a logical subject ('I') for the introductory modifying phrase 'To obtain a clearer view of the distant nebula.' A person is capable of performing the action of obtaining a view.

Step-by-Step Solution

1
Analyze the introductory modifying phrase 'To obtain a clearer view of the distant nebula' to determine what action is occurring.
The action is the act of obtaining a clearer view of the nebula.
This establishes what entity the modifier must logically describe.
2
Evaluate the two choices, 'I' and 'the telescope', to see which one can logically perform the action of obtaining a view.
A person ('I') can look through a telescope to obtain a view, whereas the telescope itself cannot perform this action.
Choosing the correct subject avoids a dangling modifier and ensures logical sentence structure.

Key Concept

An introductory modifying phrase must logically describe the subject of the main clause that immediately follows it.
Estimated Time:45s
Question 360Question →

For centuries, cartographers faced the daunting task of mapping uncharted territories using only basic tools like astrolabes and compasses. They spent months at sea, documented coastline features with painstaking precision, and would gather stories from local merchants to fill in geographic gaps. Despite these limitations, their maps remained remarkably accurate for the era.

Which of the following choices to the underlined portion is most grammatically correct and consistent with the rest of the passage?

Show answer & explanation

Answer: gathered

Answer

gathered
The correct answer is 'gathered' because it is a simple past tense verb that matches the grammatical structure and tense of the other items in the parallel series: 'spent' and 'documented'. Maintaining this consistency prevents an unnecessary shift in construction.

Step-by-Step Solution

1
Identify the verbs that form the parallel series in the second sentence of the passage.
The series consists of the verbs 'spent', 'documented', and the underlined verb phrase.
Recognizing the parallel construction is key to identifying which form the final verb in the list must take.
2
Analyze the tense of the non-underlined verbs in the parallel series.
The verbs 'spent' and 'documented' are both in the simple past tense.
To maintain parallel structure and prevent shifts in construction, the final verb in the list must match the simple past tense of the preceding verbs.
3
Evaluate the choices to find the one that matches the simple past tense without adding unnecessary words.
The choice 'gathered' is in the simple past tense and matches the established structure.
This maintains consistency in construction and tense throughout the sentence.

Key Concept

Parallel Structure and Consistency in Verb Tense
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Sentence Structure and Formation Practice Questions — ACT — Page 18 | Examkin