Question

10) How had they completed the work? (vc)​

Answer 1

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How had the work been completed by them ?

In Perfect Tense:

•  Active - WH + has/have/had (have verb) + subject + main verb (3rd form) + object + ?

• Passive - WH + has/has/had (as suitable for passive subject and tense) + passive subject (object of active) + been + main verb (3rd form) + by + passive object (subject of active) + ?

Example ↴

How had you made that silly mistake ? (active voice)

=> How had that silly mistake been made by you ? (passive voice)

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Answer 2

Explanation:

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How had the work been completed by them ?