Question

Passive voice of the monkey threw the stones at the dog

Answer 1

The stone was thrown at the dog [by the monkey]

Answer 2

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Question- Monkey threw the stones at the dog(Change into passive voice)

To convert an active voice into passive, we exchange subject of active voice into the object of passive voice, and the 3rd form of the verb is used in the Passive sentence which is the past participle, by using a helping verb we successfully change the sentence into passive.

Answer- The stone was thrown at the dog by the Monkey.  

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