Question

When did you buy it change into passive voice

Answer 1

he told me that when did you buy it.
this is the answer
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Answer 2

The sentence after changing the voice is following – When was it bought by you? In the given sentence ‘you’ acts as the subject and ‘it’ is the object.

After changing the voice it becomes the subject.

Generally passive voice is used to display interest in object or person which experiences the action rather than the object or person who performs action.