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Difficulty: Very hardVerbs, Tenses, and Aspect

Supply the correct form of the verb 'convene' to complete the unreal past construction expressing past regret in the sentence below.

Answer:If only the emergency steering committee 【had convened】 earlier, the structural failure of the municipal dam could have been averted.

Answer

The correct verb form to complete the sentence is 'had convened'.
The phrase 'If only' introduces an unreal past condition expressing regret about a situation in the past. To express a hypothetical past event that did not happen, English standard grammar requires the past perfect tense ('had convened'). This aligns correctly with the past counterfactual result clause ('could have been averted').

Step-by-Step Solution

1
Analyze the syntactic structure and temporal frame of the conditional wish clause introduced by 'If only'.
The main clause ('could have been averted') uses a perfect modal construct ('could have + past participle'), indicating an unfulfilled past counterfactual outcome.
When expressing past regrets or unfulfilled past conditions after expressions like 'If only' or 'I wish', English grammar mandates the unreal past construction using the past perfect tense.
2
Determine the required tense and aspect for the verb 'convene' in the dependent clause.
The past perfect tense form 'had convened' (had + past participle) must be used.
The past perfect tense places the hypothetical condition prior to the past reference point, forming a grammatically harmonious counterfactual statement.

Key Concept

Unreal Past Subjunctive with Past Perfect Aspect
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Topics

Verbs, Tenses, and Aspect

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