Ответ:
I.
1. A composition took a long time to be written by her. But at last It was written by her.
2. The cup shouldn't be put there: it will be broken by someone.
3. All my money has been spent on books this month.
4. It's very funny, I am always stopped by someone, when I start doing this.
5. These books had been promised by you to me a long time ago.
6. Bill's car is being watched by him now, because it is dirty.
7. An interesting game was being played by us. What was bought in internet by Margaret.
8. The cross-country race will be run by them at 3 o'clock tomorrow.
II.
1. If you are free, I will come to see you.
2. I wouldn't have come to the party yesterday if I had been invited there.
3. If she had enough time, she would go to the beach this weekend.
4. Would they have helped us if we had lost all our luggage?
5. If you spoke a foreign language, you could get a better job.
6. What will you do, when you find the truth?
III.
1. Boy told his mother that he didn't have enough time for lunch that day.
2. The pupil told teacher that he could do his homework after dinner that day.
3. She said to us that they had arrived in london the day before.
4. Ben asked me what would I be doing at ten o'clock on that Friday.
5. The teacher asked which of us was free that moment.
6. He asked me where had Chris gone when I had called him.
7. The man asked us if there was a post office near that place.
8. Barry asked Ann if she could go with him.
9. They asked if he wanted to go with them.
10. My friend told me how could he solve that problem.
11. The man said to Kate not to be afraid of his dog.