it talks about how to use must, have to and should

3. MODAL VERBS

4. MODAL VERBS
MUST

5. MODAL VERBS
MUST HAVE TO

6. MODAL VERBS
MUST
SHOULD
HAVE TO

7. MUST
1. We use “must” to give an obligation that the listener must
follow. It can be a formal law or an important obligation in
the speaker's opinion.
E.g:
- Passengers must show passports at immigration.
(Bạn phải trình hộ chiếu khi nhập cảnh) => theo luật yêu cầu
- You must come to the party as it could be the last time we see
each other.
(Bạn phải đến buổi tiệc vì đây có thể là lần cuối ta gặp nhau) =>
theo ý kiến của người nói là người nghe phải đến bữa tiệc
2. We use “must not (mustn’t)” to talk about something that is
forbidden not to do.
E.g.
- You must not give my credit card details to anyone.
(Bạn không được đưa thông tin tài khoản ngân hàng cho người
khác).

8. HAVE TO
1. We use “have to” to give a responsibility that the listener must do. Have
to is often used in everyday speech and is less formal than must.
E.g.
- Henry has to do the dishes every Wednesday.
(Henry phải rửa chén mỗi ngày thứ Tư) => theo trách nhiệm trong gia đình
2. We use don’t “have to” to talk about something we don't have to do.
E.g.
- You don’t have to wear a uniform to work (Bạn không cần phải mặc đồng phục
khi đi làm).

9. 1. When we were at school we ____________ wear a uniform.
2. We _____________ go for a drink one day.
3. You ____________ be an expert to use the basic functions of program.
4. What are you doing? You ________________be here!
5. You _____________to tell her that you are sorry.
6. We _____________go to the meeting. Why didn’t you go?
7. You ________________ turn off your mobile phone on a plane.

10. 1. When we were at school we ____had to________ wear a uniform.
2. We _____________ go for a drink one day.
3. You ____________ be an expert to use the basic functions of program.
4. What are you doing? You ________________be here!
5. You _____________to tell her that you are sorry.
6. We _____________go to the meeting. Why didn’t you go?
7. You ________________ turn off your mobile phone on a plane.

11. 1. When we were at school we ____had to________ wear a uniform.
2. We ________must_____ go for a drink one day.
3. You ____________ be an expert to use the basic functions of program.
4. What are you doing? You ________________be here!
5. You _____________to tell her that you are sorry.
6. We _____________go to the meeting. Why didn’t you go?
7. You ________________ turn off your mobile phone on a plane.

12. 1. When we were at school we ____had to________ wear a uniform.
2. We ________must_____ go for a drink one day.
3. You _______don’t have to_____ be an expert to use the basic functions of
program.
4. What are you doing? You ________________be here!
5. You _____________to tell her that you are sorry.
6. We _____________go to the meeting. Why didn’t you go?
7. You ________________ turn off your mobile phone on a plane.

13. 1. When we were at school we ____had to________ wear a uniform.
2. We ________must_____ go for a drink one day.
3. You _______don’t have to_____ be an expert to use the basic functions of
program.
4. What are you doing? You _______must not_________be here!
5. You _____________to tell her that you are sorry.
6. We _____________go to the meeting. Why didn’t you go?
7. You ________________ turn off your mobile phone on a plane.

14. 1. When we were at school we ____had to________ wear a uniform.
2. We ________must_____ go for a drink one day.
3. You _______don’t have to_____ be an expert to use the basic functions of
program.
4. What are you doing? You _______must not_________be here!
5. You _______have got to______to tell her that you are sorry.
6. We _____________go to the meeting. Why didn’t you go?
7. You ________________ turn off your mobile phone on a plane.

15. 1. When we were at school we ____had to________ wear a uniform.
2. We ________must_____ go for a drink one day.
3. You _______don’t have to_____ be an expert to use the basic functions of
program.
4. What are you doing? You _______must not_________be here!
5. You _______have got to______to tell her that you are sorry.
6. We _______had to______go to the meeting. Why didn’t you go?
7. You ________________ turn off your mobile phone on a plane.

16. 1. When we were at school we ____had to________ wear a uniform.
2. We ________must_____ go for a drink one day.
3. You _______don’t have to_____ be an expert to use the basic functions of
program.
4. What are you doing? You _______must not_________be here!
5. You _______have got to______to tell her that you are sorry.
6. We _______had to______go to the meeting. Why didn’t you go?
7. You ___________must_____ turn off your mobile phone on a plane.

17. SHOULD
1. We use "should" to make suggestions about what one thing should be done in one
case instead of another.
2. Negative form: "shouldn't (should not)" to talk about what not to do
E.g.
- You shouldn’t close the door that hard (Bạn không nên đóng cửa mạnh như thế).

18. Exercise
1. John's a millionaire. He ______ go to work.
A. doesn’t have to B. mustn’t C. shouldn’t
2. You ______ smoke inside the school.
A. don’t have to B. shouldn’t C. mustn’t
3. You ___ not be late again or you’ll lose your job.
A. should B. had better C. must
4. She’s always tired. She ______ go to bed late every night.
A. should not B. must not C. had better not

19. Exercise
1. John's a millionaire. He ______ go to work.
A. doesn’t have to B. mustn’t C. shouldn’t
2. You ______ smoke inside the school.
A. don’t have to B. shouldn’t C. mustn’t
3. You ___ not be late again or you’ll lose your job.
A. should B. had better C. must
4. She’s always tired. She ______ go to bed late every night.
A. should not B. must not C. had better not

20. Exercise
1. John's a millionaire. He ______ go to work.
A. doesn’t have to B. mustn’t C. shouldn’t
2. You ______ smoke inside the school.
A. don’t have to B. shouldn’t C. mustn’t
3. You ___ not be late again or you’ll lose your job.
A. should B. had better C. must
4. She’s always tired. She ______ go to bed late every night.
A. should not B. must not C. had better not

21. Exercise
1. John's a millionaire. He ______ go to work.
A. doesn’t have to B. mustn’t C. shouldn’t
2. You ______ smoke inside the school.
A. don’t have to B. shouldn’t C. mustn’t
3. You ___ not be late again or you’ll lose your job.
A. should B. had better C. must
4. She’s always tired. She ______ go to bed late every night.
A. should not B. must not C. had better not

22. Exercise
1. John's a millionaire. He ______ go to work.
A. doesn’t have to B. mustn’t C. shouldn’t
2. You ______ smoke inside the school.
A. don’t have to B. shouldn’t C. mustn’t
3. You ___ not be late again or you’ll lose your job.
A. should B. had better C. must
4. She’s always tired. She ______ go to bed late every night.
A. should not B. must not C. had better not