1. Read the dialogue. Who has a problem with their phone: Freya, Archie or both? Explain your answer.

(Đọc đoạn hội thoại. Ai gặp sự cố với điện thoại của họ: Freya, Archie hay cả hai? Giải thich câu trả lơi của bạn)

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!

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.

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

(Đọc Learn this! Gạch dưới must/have to + infinitive trong đoạn hội thoại. Sau đó hoàn thành các câu sau sử dụng '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.

5. USE OF ENGLISH Complete the second sentence so that it means the same as the first. Include the word in brackets.

(Hoàn thành câu thứ hai sao cho nghĩa giống như câu thứ nhất. Bao gồm từ trong ngoặc)

1. It was a bad idea for you to lend Jake your phone. (shouldn't)

You ____________________ Jake your phone.

2. It’s possible that Fraser deleted your messages by accident. (could)

Fraser ____________________ by accident.

3. The only possible explanation is that you sent that email to the wrong person. (must)

You ____________________  the wrong person.

4. It’s possible that I didn’t dial the correct number. (may)

I ____________________ the correct number.

5. Leaving your phone on was a bad idea. (should)

You ____________________ your phone off.

6. It’s not possible that Tom phoned Kim. (can’t)

Tom ____________________ Kim.