Answer keys of exercises of obligation and necessity

Complete the sentences using the correct form of must, mustn’t, have to or don’t have to

1. I           have to            speak English well. I need it in my job.
2. I           must    speak English well. I want to speak to foreigners.
3. I           must    get up early. I want to go camping.
4. I           have to            get up early. I go to work.
5. I           have to            wear a dress. It’s a formal party.
6. I           must    wear a dress. I want to be good-looking.
7. I           must    follow the instructions. I don’t want to be wrong.
8. I           have to            follow the instruction. It’s my duty.
9. I           have to            earn money for a living.
10. I           must    earn a lot of money. I want to buy a new car.
11. Football players           have to            attend the training.
12. You      don’t have to   buy that CD. I can give you one.
13. Look at my bike. It’s too dirty. I           must    wash it as soon as possible.
14. I have just ordered some pizza. You  don’t have to   cook tonight.
15. You      must    remember what I said to you. It’s very important.
16. My teacher gave me an essay to write.  I      have to            write it now.
17. They    mustn’t            go to work late.
18. I           must    call my mother for her birthday today.
19. When you go shopping, you don’t have to     buy something.
20. You      mustn’t            cheat during exams.

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