We may finish the leftover in the refrigerator.
The leftover in the refrigerator may be finished by us.
The mailman is delivering the mail now.
The mail is being delivered by the mailman now.
The citizens are defending the city bravely.
The city is being defended by the citizens bravely.
He has to pay the bill before the first of the month.
The bill has to be paid by him before the first of the month.
They may organize a new group next week.
A new group may be organized by them next week.
He may pay the bill for us.
The bill may be paid by him for us.
For the time being, Karen is teaching that group.
That group is being taught by Karen for the time being.
You ought to water the plant once a week.
The plant ought to be watered by you once a week.
You ought to send the package by registered mail.
The package ought to be sent by you by registered mail.
The police are holding him for further questioning.
He is being held by the police for further questioning.
He has to finish it today.
It has to be finished by him today.
They may deliver the merchandise while we are out.
The merchandise may be delivered by them while we are out.
They should send it to us at once.
It should be sent to us by them at once.
They cannot hold the meeting in that room.
The meeting cannot be held by them in that room.
Congress is debating that question today.
That question is being debated by Congress today.