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.

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 sentences using the correct forms of the words in 1.

1. People mustn't drive after drinking _____________. It’s dangerous!

2. The boy does not want to go to school because he is afraid of being _____________.

3. Many children live in ______________. They often stop going to school so that they can work.

4. Many parents compiain about the number of ____________ TV programmes for children.

5. We are going to start a ______________ to raise awareness of animal rights.

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.

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