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Đáp án bài tập sự bắt buộc và cần thiết – Obligation and Necessity: must or have to

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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