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.