3. Read the Learn this! box and complete the rules. Use must, mustn't, needn't and don't have to. Use your answers to exercise 2 to help you.

(Đọc hộp Learn this! và hoàn thành các quy tắc. Dùng must, mustn't, needn't and don't have to. Sử dụng các câu trả lời trong bài 2 để giúp bạn.)

LEARN THIS! must, mustn't and needn't/ don't have to

a. We use (1) _____ to say that something is necessary or very important to do.

b. We use (2) _____ and (3) _____ to say that something is not necessary.

c. We use (4) _____ to say that something is prohibited (a negative order)

Note: We can also use passive forms after modal verbs.

Helmet must be worn at all times.

Circle the correct answers to complete the sentences.

1. You must/mustn't respect older people. You can learn some valuable lessons from them.

2. We don't have to/have to wear uniforms on weekdays. It's the rule at our school.

3. You should/mustn't ask your parents for permission if you want to colour your hair.

4. In the past, women had to/must do all house work. It was one of their duties.

Complete the sentence with "must/mustn't(don't) have to/had to +V"

phone wear study be hurry go get up listen

1. He............... harder to pass the final xam.

2. You.................... early yesterday morning but you didn't.

3. Students in this school............... uniform to school on Wednesdays and Thursdays.

4.You............. more careful with this elephant.

5. I.................. her yesterday, but I forget.I must phone her later today.

6. He........ fast at the intersection.

7. Students.............. to the teacher's explaining carefully.

8. You................. or e'll miss the train.

Read the Learn this! box. a) Underline must/have to + infinitive in the dialogue. Then complete the following sentences using must mustn't have to don't have to.

1 A hotel receptionist ______ be good at communication.

2 You ______ pay for the tickets in advance.

3 Examinees ______ switch off all modern gadgets during the exams.

4 You ______ leave litter lying around.

Study these sentences. Then complete rules 1-4.

You have to be a really strong swimmer.

I must get really good marks.

I don't have to make a decision right now.

My friends say I should become a nurse.

You mustn't do something you aren't sure about.

I don't need to do an apprenticeship.

Bài tập 3: Chọn trợ động từ thích hợp và điền vào chỗ trống Can - could - might - ought to - should - may - would - must - had better - will - shall - have to 1. ........................... you please show me the way to train station? 2. You ........................... study for your math test or you won’t do well. 3. If Sue wants to buy a car this summer, she ........................... get a part-time job. 4. Ryan ........................... remember his wife’s birthday this year. 5. Tim ........................... share his pizza with you if you ask him nicely. 6. I ........................... speak Korean fluently when I was a child and we lived in Korea. 7. I ........................... like to buy the same bicycle that you have. 8. Even though you’re growing up, you ........................... never stop having fun. 9. ........................... you play the piano? 10. I am determined that my son ........................... go to Harvard. 11. The children ........................... wake up earlier that 7:30 am. They have to at camp at 8:00 am. 12. Nicole ........................... visit her grandmother this weekend.

 Điền trợ động từ thích hợp vào chỗ trống: Can - may - must - should - ought to - might - will - couldn’t Can - could - might - ought to - should - may - would - must - had better - will - shall - have to

1 I wasn't tired but my friend ........

2 I like hot weather but Ann ....

3 "Is Colin here?" "He .... five minutes ago, but I think he's gone home now."

4 Liz said she might phone later this evening but I don't think she ....

5 "Are you and Chris coming to the party?" "I .... but Chirs ...."

6 I don't know whether to apply for the job or not. Do you think I .... 7 "Please don't tell anybody what I said." "Don't worry I ...."

8 "You never listen to me." "Yes I ...."

9 "Can you play a musical instrument." "No but I wish I ...."

10. "Please help me." "I'm sorry. I .... if I .... , but I ...."

Choose the correct answers A, B, C or D to complete the following sentences. 

1. You ________________ learn to keep your bedroom tidy. No one can clean it for you.

A. must                 B. had to               C. mustn't                   D. shouldn't

2. Fifty years ago, my grandmother ________________  stay at home and do all housework. She couldn't go to school like her brothers.

A. must              B. had to              C. didn't have to               D. should

3. You ________________ wear shorts to school. It's against the school rules.

A. should               B. have to                 C. mustn't              D. don't have to

4. I think parents ________________ compare their children to other's. They will become less confident in their abilities.

A. should                B. have to               C. must                   D. shouldn’t

5. My parents respect my choices. I ________________ follow in their footsteps.

A. don't have to                  B. mustn't                C. should               D. have to