1. Mary types letters in the office.
=> Letters are typed in the office by Mary.
2. His father will help you tomorrow.
=> You’ll be helped by his father tomorrow.
3. Science and technology have completely changed human life.
=> The human life has completely been changed with science and technology.
4. Peter broke this bottle.
=> This bottle was broken by Peter.
5. They are learning English in the room.
=> English is being learnt in the room.
6. Nothing can change my mind.

=> My mind can’t be changed.
7. No one had told me about it.
=> I hadn’t been told about it.
8. I don’t know her telephone number
=> Her telephone number isn’t known.
9. My students will bring the children home.
=> The children will be brought home by my students.
10. They sent me a present last week.
=> I was sent a present last week.

7.

1. This dress can’t be washed; it must be dry-cleaned.

2. The wine should be opened about three hours before it is used.

3. Books may be kept for three weeks. After that they must be returned.

4. These calculations used to be done by men; now they are done by computer.

5. Tickets shouldn’t be thrown away as they may be checked during the journey.

6. The car will have to be towed to the garage.

7. Umbrellas and sticks must be left in the cloakroom.

8. Those books should have been taken to the library.

9. Articles (which have been) bought during the sale cannot be exchanged.

10. This man mustn’t be moved; he is too ill/ he is too ill to be moved. He will have to be left here

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