Question

He lost his watch change into passive voice

Answer 1

Here's the answer:

"His watch was lost by him."

Enjoy!

Answer 2

Here is the right answer:

His watch was lost by him.

Explanation

The verb in the sentence was Simple Past in the active form (lost). When we convert the active voice of Simple Past into passive voice, we use passive form equivalent to the active form. The active form in Simple past is 'V2' or Simple Past form of the verb. The object is made the subject and vice versa; 'by' is added. The passive form in Simple Past is was/were +V3.  

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