Question

convert into passive voice : where did you kept my watch?

Answer 1

The answer is...

Where was my watch kept by you?

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Answer 2

$<h4> ANSWER : Where was my watch kept by you ?$

RULE : IN ACTIVE,

Tense - Simple Past ( Interrogative)

IN PASSIVE VOICE,

Tense - Simple Past changes into PAST continuous with verb's 3rd form.

Did is changed into was because watch is singular.

❇ Question form remains in question form, we do not change it in assertive one.