Question

they have done their homework what is the passive form

Answer 1

Their homework has been done by them.

Hope it helps.

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Answer 2

Answer:

Their homework has been done by them.  

Explanation:

When the subject does the action, then it is a passive voice. When the action done is not known, then it is a passive voice. More natural and normal and comfortable form of use in grammar is the Active voice.  

When we focus on the object for completion in a sentence, we use the passive voice. In the passive voice, the sentence is with the object into consideration.

Example: Active Voice: Straight collects leaves.

                Passive voice: Leaves are collected by Straight.