Examkin

Soru

Zorluk: Çok zorVerb Tense and Consistency

Choose the option that best maintains a consistent and parallel sequence of verb tenses in the passage below.

In the late 1960s, a team of oceanographers mapping the Mid-Atlantic Ridge discovered hydrothermal vents spewing superheated water into the ocean. The discovery, which challenged the long-held belief that all marine life depended on sunlight for energy, revealed a thriving ecosystem sustained by chemosynthesis. Since then, researchers studying each hydrothermal vent have identified hundreds of new species, documented unique symbiotic relationships, and are demonstrating how life could exist on other planets.

Which of the following choices is the best replacement for the underlined portion of the sentence?

  1. A
    NO CHANGE
  2. B
    has demonstrated
  3. demonstratedCevap
  4. D
    to demonstrate

Cevap

The correct option is 'demonstrated'. Using this past participle maintains the present perfect tense and the parallel structure of the list.
The correct choice is 'demonstrated'. The sentence begins with the phrase 'Since then,' which anchors the action in the present perfect tense. The sentence uses a compound predicate to list three actions performed by the plural subject 'researchers': 'have identified,' '[have] documented,' and '[have] demonstrated.' Using the past participle 'demonstrated' maintains both the present perfect tense consistency and the parallel structure of the list.

Adım Adım Çözüm

1
Identify the tense and grammatical structure of the sentence containing the underlined portion.
The sentence begins with the phrase 'Since then,' which establishes a present perfect timeline. It contains a compound predicate (a list of actions) performed by the subject 'researchers': 'have identified...', '[have] documented...', and 'and [have]...'.
Recognizing the sentence structure and the temporal anchor helps determine the correct verb tense and parallel form needed.
2
Analyze the parallel elements in the compound predicate list.
The first verb is 'have identified' (present perfect). The second verb is 'documented' (past participle, with the auxiliary verb 'have' omitted but understood: '[have] documented'). The third verb must also be a past participle to complete the parallel structure: '[have] demonstrated'.
Compound predicates sharing an auxiliary verb must use parallel verb forms to maintain grammatical consistency.
3
Evaluate the choices to find the past participle that matches the plural subject 'researchers' and maintains parallelism.
The past participle form 'demonstrated' correctly matches the plural subject and parallel structure, whereas 'are demonstrating' shifts tense, 'has demonstrated' violates subject-verb agreement, and 'to demonstrate' violates parallelism.
Selecting the past participle ensures grammatical correctness and tense consistency.

Anahtar Kavram

Maintaining verb tense consistency and parallel structure in a compound predicate.
Bu soruyu puanla

Konular

Verb Tense and Consistency

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