1. Our teacher wants us to prepare our lessons carefully.

Our teacher wants our lessons to be prepared carefully.

2. They expected me to finish my work early.

They expected my work to be finished early.

3. Is she making big cakes for the party?

Are big cakes being made by her for the party?

4. The house needs cleaning.

The house needs to be cleaned.

5. It was impossible to preserve river water in the past.

River water couldn't be preserved in the past.

6. He made me stay outside yesterday.

I was made to stay outside yesterday.

7. The teacher let us go home early last week.

We were allowed to go home early by the teacher last week.

8. He had the waiter carry the luggage home.

He had the luggage carried home by the waiter.

9. I got the postman to post the letter for me.

I got the letters posted by the postman.

10. Turn on the lights!

The lights should be turned on!