1. He will repair your car.
Your car will be repaired by him
2. He can repair your car.
Your car can be repaired by him
3. They must test this new machine.
This new machine must be tested.
4. You have to finish your homework by ten o’clock.
Your homework has to be finished by ten o’clock
5. You could do it at that time.
It could be done at that time
6. Someone has stolen my bike.
My bike has been stolen
7. Some must have stolen my bike.
My bike must have been stolen
8. The police will arrest the robbers.
The robbers will be arrested by the police.
9. They could not find him.
He could not be found
10. We must sell all these books.
All these books must be sold
11. He has to deliver these machines at once.
The machines have to be delivered by him at once
12. The workers will build a new bridge here.
A new bridge will be built by the workers
13. The workers built the bridge in 2005.
The bridge was built by the workers in 2005
14. I was making a model plane.
A model plane was being made by me.
15. I have delivered all the letters.
All the letters have been delivered by me