Question

Change the voice :
(ii) What have you done ?

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Answer 1

Answer:

How have it been done by you ?

In passive voice, we should write question as question. So, keep the word 'How' as it is.

The sentence contains only 'have' not ' have been ' . So, the voice is Active.

Interchange the subject and object. write the object between Have and been.

Answer 2

Answer:

Your sentence: Why have you done this?

First of all, forget the word why and then make this interrogative into affirmative sentence. The sentence becomes:

You have done this.

Now, it is simple to make passive of it.

This has been done by you.

Your sentence was interrogative but this is a passive of affirmative sentence. For making it passive of interrogative sentence, change the positions of subject and verb. Now, the passive becomes:

Has this been done by you?

But in the starting, we forgot the question word why. Now, this time put why in the starting to make the complete passive of the given sentence.

Why has this been done by you?

I hope this will help U