Question

when had he rung the bell?? change into past perfect passive voice​

Answer 1

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When had he rung the bell ? (Change into passive voice)

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When had the bell been rung by him ?

Structure ↴

Wh word + had + subject + been + past participle form of the main verb + preposition + object + question mark (?)

Extra Information ↴

To turn active sentences beginning with 'Wh_words' into passive ones, the appropriate forms of the helping verbs are placed after the 'Wh_words'.

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Answer 2

Answer:

when had the bell been rung by him?