Question

Who has stolen my pen change into passive voice

Answer 1

By whom has my pen been stolen?

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Answer 2

Answer:

The given sentence is in active voice and when changed into the passive voice it becomes-

By whom has my pen been stolen?

Explanation:

When a question beginning with the word 'who' is given in the active voice, it becomes 'by whom' in the passive voice and the sentence starts it with followed by the rest of the sentence.