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.

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.

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

complete the sentence with " must , mustn't , have to or ought to " ( make changer if neesary .

1. we don't ________ go home befor 17:00 every day .

2. You ___________ read the book . It's really excellent .

3. you ____________ drive on the left when you are in Viet Nam .

4. left tired and ____________ go to bed early last night 

5. keep silent ! all of you ___________ wear helmet when you drive .

6. because i đin't have enough money , i ______________ lent some more form him .

giúp mình với nhé mình cảm ơn rất nhiều ạ

Bài 13: Complete the sentences with mustn't or don't/doesn't have to

1. I don't want anyone to know about our plan. You mustn't tell anyone.

2. Richard doesn't have to wear a suit to work but he usually does.

3. I can stay in bed tomorrow morning because I ……………………….. go to work.

4. Whatever you do, you .................................. touch that switch.It's very dangerous.

5. There's a lift in the building so we ……………………………….. climb the stairs

6. You ........................................... forget what I told you.It's vry important.

7. Sue ………………………..... get up early, but she usually does.

8. Don't make so much noise. We ………………………………... wake the children.

9. I …………………………….. eat too much.I'm supposed to be on a diet

10. You ……………………………... be good player to enjoy a game of tennis.

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

1. If you want to maintain a healthy weight, you _________ have snacks between meals.

A. shouldn't             B. should            C. must              D. don't have to

2. I __________ strictly follow the doctor’s instructions if I want to get better quickly.

A. shouldn't           B. must                C. can                D. don't have to

3. The government ___________ improve the infrastructure of big cities to boost the economy.

A. mustn't             B. doesn't have to            C. should             D. didn't have to

4. People living in high-rise buildings ___________ obey the safety rules and regulations strictly.

A. shouldn't              B. mustn't             C. may              D. have to

5. Lots of women in the past ___________ stay at home, look after their children, and do all housework.

A. must                 B. should                C. had to             D. have to

6. My parents respect my career choice, so I __________ follow in their footsteps.

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

 1:Complete the sentences with mustn't or don't/ doesn't have to
1. I don't want anyone to know about our plan. You _____ tell anyone.
2. Richard _____ wear a suit to work but he usually does.
3. I can stay in bed tomorrow morning because I _____ go to work.
4. Whatever you do, you_____ touch that switch. It's very dangerous.
5. There's a lift in the building so we _____ climb the stairs.
6. You _____ forget what I told you.It's very important.
7. Sue _____ get up early, but she usually does.
8. Don't make so much noise. We _____ wake the children.
9. I _____ eat too much. I'm supposed to be on a diet.
10. You _____ be good player to enjoy a game of tennis.

1. Complete the text by writing one word in each gap. The first letter for each word is given

I work in a supermarket. I don't(0) eam much because it's only a (1) p.......-t.......job - I only work in the evenings. Some evenings I work on the (2) c....... It's boring. I sit there. People put their shopping down and I tell them how much it costs. On other days, I go into the car park to tidy the shopping (3) t........ and bring them back into the shop. People take them to their cars, put all the food into their cars and then drive away. I like doing that. I (4) w....... alone and I can relax in the fresh air. We don't have to wear a uniform but we have to look nice - I wear smart (5) t...... - not jeans - and black shoes.