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Zorluk: ZorVerb Tense and Consistency

Deep below the ocean's surface, hydrothermal vents spew mineral-rich water heated by magma beneath the Earth's crust. Although scientists initially assumed that all life on Earth relied on solar energy, the discovery of these vents proved that ecosystems can thrive in absolute darkness. In these unique environments, specialized bacteria oxidize toxic hydrogen sulfide to produce organic carbon. This chemical conversion process, which bypasses photosynthesis entirely, sustained a diverse web of organisms, supports the surrounding food chain, and feeds specialized deep-sea creatures.

Which choice best maintains a consistent tense and grammatically correct structure throughout the passage?

  1. A
    NO CHANGE
  2. sustainsCevap
  3. C
    sustain
  4. D
    sustaining

Cevap

sustains
The correct answer is the singular present-tense verb 'sustains.' This form matches the present-tense timeline of the paragraph (established by verbs like 'spew,' 'oxidize,' and 'feeds') and maintains parallel structure with 'supports' and 'feeds' in the list of verbs. It also agrees with the singular subject 'process.'

Adım Adım Çözüm

1
Analyze the context and surrounding verbs to establish the time frame of the passage.
The passage describes the general, ongoing biological processes of hydrothermal vent ecosystems using present-tense verbs such as 'spew,' 'oxidize,' and 'feeds.'
Establishing the narrative tense helps determine whether a past or present tense verb is appropriate for the underlined portion.
2
Identify the grammatical structure of the sentence containing the underlined verb.
The sentence features a singular subject ('This chemical conversion process') followed by a list of three parallel verbs in a compound predicate: the underlined verb, 'supports,' and 'feeds.'
Recognizing the parallel list and the subject-verb relationship allows you to match the correct verb form for both tense consistency and agreement.
3
Select the verb form that matches the tense of the list and the singular subject.
The verb must be present tense and singular to match 'process' and run parallel to 'supports' and 'feeds.' The correct form is 'sustains.'
Only the singular present-tense verb satisfies both subject-verb agreement and tense parallelism requirements.

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Verb Tense and Consistency
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Verb Tense and Consistency

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