C) use must/mustn`t / have to or (not) have to: 1. i can stay in bed tomorrow morning because i ……………………………. work. 2. whatever you do, you ……………….. touch that switch. it`s very dangerous. 3. you ……………………………forget what i told you. it`s very important. 4. we………………………. leave yet. we`ve got plenty of time. 5. ann was feeling ill last night. she …………………leave the party early. 6. i ………………………….go to the bank yesterday to get some money. 7. the windows are very dirty. i ……………………. clean them. 8. the windows aren`t dirty. you ……………………. clean them. 9. we arrived home very late last night. we ……………… wait half an hour for a taxi. 10. these cakes are very nice. you ……………………. have one. 11. we …………………………… take an umbrella. it`s not going to rain.

1. I can stay in bed tomorrow morning because I don't have to work.
2. Whatever you do, you mustn't touch that switch. It`s very dangerous.
3. You mustn't forget what I told you. It`s very important.
4. We don't have to leave yet. We`ve got plenty of time.
5. Ann was feeling ill last night. She had to leave the party early.
6. I had to go to the bank yesterday to get some money.
7. The windows are very dirty. I must clean them.
8. The windows aren`t dirty. You don't have to clean them.
9. We arrived home very late last night. We had to wait half an hour for a taxi.
10. These cakes are very nice. You must have one.
11. We don't have to take an umbrella. It`s not going to rain.