He has already finished his exercises.

-> His exercises have already been finished.
People planted rice in those fields.

-> Rice is planted in those fields.
Nam can write a car and a truck.

-> A car and a truck can be driven by Nam.
Why did this boy break my window yesterday?

-> Why was my window broken by this boy yesterday?
They have not known him well.

-> He has not been known well.
We will meet our pen pals at the station.

-> Our pen pals will be met at the station.
Did you do your test perfectly?

-> Was your test done perfectly?
Why didn’t you learn this lesson?

-> Why wasn't this lesson learned?
How long have they done their work?

-> How long has their work been done?
No one could help him.

-> He couldn't be helped.//////