a) In đậm

Freya: I can't find my camera, Archie.

Archie: There it is. It's under your bag. Why do you have to bring it to class?

Freya: I must take it to my photography class today. By the way, I didn't understand that email you sent

me yesterday.

Archie: I didn't send any emails yesterday.

Freya: Well, you might have sent it earlier. But I got it yesterday.

Archie: I can't have sent you an email. My phone hasn't been working for a week.

Freya: Somebody must have used your account. The email had a link to a competition, but when I clicked on it, nothing happened.

Archie: Oh no! You shouldn't have clicked on the link. You've possibly downloaded some malware onto your phone.

Freya: That's terrible! You should have warned me earlier.

Archie: I didn't know! Anyway, you might not have downloaded anything. It's possible that you were lucky. You just need to wait and see.

Freya: Anyway, you need to warn your other friends. That email could have gone to everybody in your address book!

b)

1 A hotel receptionist must be good at communication.

(Lễ tân khách sạn phải giỏi giao tiếp.)

2 You have to pay for the tickets in advance.

(Bạn phải trả tiền vé trước.)

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

(Thí sinh phải tắt tất cả các thiết bị hiện đại trong khi làm bài thi.)

4 You must not leave litter lying around.

(Bạn không được để rác bừa bãi.)

1. C. must.
2. A. must.
3. A. must.
4. D. must.
5. C. can.

1 C

2 A

3 B

4 C

5 D

mustn't

- must + V: phải làm gì (mang tính bắt buộc)

- mustn't + V: cấm làm gì, buộc người khác không được làm gì

mustn't

ở đây sẽ mang nghĩa theo ý thức của người nói

 Tai never have time _.............................the whole game.

      A. play        B. playing      C. to play             D. plays

She always goes to school on time. She is never _____________ for  school.

A. early              B. free      C. late                D. nervous

 ………………..she go to the cinema once a month? – Yes, she does.

      A. Do        B. Are  C. Does              D. Is

Nga: Would you like to see a movie tonight?

Minh: _______________________________

A. Thank you.             B. Yes, I’d love to.   C. I like D. You, too.

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.

1: must

2: have to

3: should

4: had to

C

d

I have to leave to pick up the kids at school.
a.  must b.  should c.  ought to  d. need to

D

1. must/ have to/ need to

2. should/ shouldn't

3. mustn't

4. don't have to/ don't need to

1. We use MUST to say something is necessary because of a situation or a rule.

We use HAVE TO and NEED TO when the speaker feels that it is very important to do something, or when we talk about written rules.

2. We use SHOULD and its negative form SHOULDN'T to give advice, or to say something is a good or bad idea.

3. We use MUSTN'T to talk about something that is prohibited.

4. We use DON'T HAVE TO and DON'T NEED TO to say something isn’t necessary.