Question

Who told you this?

what are they doing ?
when has he completed his work?
why will you call all? change to passive voice​

Answer 1

1. Who told you this?

By whom was this told to you? (passive voice)

2. What are they doing?

What is being done by them? (passive voice)

3. When has he completed his work?

When has been his work completed by him? (passive voice)

4. Why will you call all?

Why will all be called by you? (passive voice)