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Question

Difficulty: MediumActive and Passive Voice Transformation

Complete the sentence below by writing the correct passive verb phrase in the blank to complete the passive transformation of the active event.

Answer:Before the official inauguration commenced, the new laboratory equipment 【had been thoroughly tested】 by the senior technical inspectors.

Answer

had been tested (or 'had been thoroughly tested')
The sentence establishes a past time frame ('before the official inauguration commenced') prior to which the testing action was completed. The passive voice of the past perfect tense requires 'had been' combined with the past participle 'tested' (or 'thoroughly tested').

Step-by-Step Solution

1
Determine the tense and aspect required by the sentence context.
The action occurred prior to another past event ('before the official inauguration commenced'), requiring the past perfect tense.
The past perfect tense indicates a completed action prior to a specified point in the past.
2
Construct the passive verb phrase for the past perfect tense.
The past perfect passive structure consists of 'had been' + past participle ('tested').
Transforming an active past perfect verb into the passive voice requires inserting the auxiliary 'been' between 'had' and the past participle verb form.

Key Concept

Past Perfect Passive Voice Transformation
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Topics

Active and Passive Voice Transformation

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