Examkin

Question

Difficulty: MediumModal Auxiliaries and Expressing Modality

Complete the sentence below by filling in the blank with the appropriate modal auxiliary verb phrase to express a past unfulfilled obligation.

Answer:The senior ecologist noted that the field research team 【should have reinforced】 the perimeter fencing around the endangered nesting zone before the rainy season began, but their unexpected delay resulted in severe habitat destruction.

Answer

should have reinforced (or ought to have reinforced / should have secured / ought to have secured)
The sentence requires a modal construction expressing past unfulfilled duty or criticism of an omitted past action. The structure 'should have reinforced' (or 'ought to have reinforced') properly expresses that the team was obliged to complete the action before the rains, but failed to do so.

Step-by-Step Solution

1
Analyze the context of the sentence to identify the necessary modal aspect.
The clause 'but their unexpected delay resulted in severe habitat destruction' indicates an action that was mandatory or advisable in the past, but was not carried out.
The narrative context establishes a past unfulfilled obligation or a past duty that was neglected.
2
Select the correct grammatical modal verb structure for past unfulfilled obligation.
The structure 'should have + past participle' or 'ought to have + past participle' correctly conveys a past action that ought to have happened but did not.
In standard English grammar, modal perfection ('modal + have + past participle') expresses past modality, specifically regret, criticism, or unfulfilled obligation.

Key Concept

Modal Auxiliaries for Past Unfulfilled Obligation
Rate this question

Topics

Modal Auxiliaries and Expressing Modality

More questions from this topic