Question

somebody must have taken my wallet into passive voice​

Answer 1

my wallet must have been taken by someone.

Answer 2

Answer:

My wallet must have been taken.

Explanation:

According to English grammar rules,

1. The structure needs to be changed first so that object of the active voice becomes subject of the passive voice. In this case, it is the wallet.
2. The verb needs to be changed from past tense to past continuous tense. In this case this is the reason why "been" has been added.
3. In passive voice the subject from active voice does not matter as long as it is someone unknown. It can be omitted while conversion to passive voice. Hence, here the word "somebody" is omitted.

Keeping the above in mind, the passive voice of this sentence becomes -

My wallet must have been taken.

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