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Difficulty: MediumShifts in Construction

To prevent an inconsistent shift in verb tense, write the appropriate form of the verb 'assess' in the blank.

Answer:While conducting their annual survey, the marine biologists observed the behavior of the reef fish, measured the water temperature, and 【assessed】 the health of the coral colony.

Answer

assessed
The correct verb form is 'assessed' because it matches the past-tense, active-voice verbs 'observed' and 'measured' that appear earlier in the series. Maintaining this tense and voice prevents an inconsistent shift in construction, which is required for grammatical correctness.

Step-by-Step Solution

1
Analyze the sentence structure and identify the verbs that establish the pattern.
The verbs 'observed' and 'measured' are past-tense, active-voice verbs in a parallel list.
This establishes a consistent past-tense construction that must be maintained throughout the sentence.
2
Determine the correct grammatical form of the target verb 'assess' to maintain parallel structure.
The past-tense form 'assessed' is required.
Using any other form (like 'assessing' or 'assess') would cause an illogical and grammatically incorrect shift in construction.

Key Concept

Shifts in Construction
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Topics

Shifts in Construction

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