Task 3 - 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 - SHS Friends Global 11 page 64

1. Nội dung câu hỏi

LEARN THIS! Must vs have to

a Must and have to both mean obligation. Must expresses obligation imposed by the speaker while have to expresses external obligation.

b Mustn't: it's necessary not to do something

You mustn't use a dictionary during your test.

c Don't have to: it's not necessary to do something

You don't have to answer all of the questions.

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!

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.

2. Phương pháp giải

Đọc khung Learn this! a) Gạch chân must/have to + infinitive trong đoạn hội thoại. Sau đó hoàn thành các câu sau bằng cách sử dụng must not / have to / don't have to.

- must + Vo: phải

- must not + Vo: không được

- have to + Vo: phải

- don’t have to + Vo: không cần

3. Lời giải chi tiết

a) Gạch chân

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.)