change:1)Why is he doing this( into passive voice.).2)Buy an umbrella( into passive).3)Will milk be drunk by her?(into active).4)Let the rubbish be thrown into the dustbin (into active).​

1. Why is he doing this? (into passive voice)

Ans. Why this is being done by him?

2. Buy an umbrella. (into passive)

Ans. Let an umbrella be bought.

3. Will milk be drunk by her? (into active).

Ans. Will she drink milk?

4. Let the rubbish be thrown into the dustbin. (into active).

Ans. Throw the rubbish into the dustbin.

is this the question?

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