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.

5. Read the Look out! box. Then, using the words in brackets, rewrite the sentences so that they have the same meaning.

LOOK OUT!

a. must and have to are very similar. However, must often expresses the feelings of the speaker. (must và have to rất giống nhau. Tuy nhiên, must thường thể hiện cảm xúc của người nói.)

You must do more exercise. (That's my strong opinion.) (Bạn phải làm nhiều bài tập hơn nữa.) (Đó là một quan điểm rất mạnh.)

have to often expresses an external obligation. (have to thường chỉ sự bắt buộc từ bên ngoài.)

You have to wear a helmet. (It's the law.) (Bạn phải đội mũ bảo hiểm.) (Đây là luật.)

b. mustn't and don't have to do NOT have the same meaning. don't have to = needn't, but mustn't means 'it is prohibited’.  (mustn’t và don’t have to không cùng nghĩa. don’t have to = needn’t, nhưng mustn’t nghĩa là “nó bị cấm”.)

1 It isn't necessary for you to help me. (needn't)

2 It's compulsory for us to wear school uniform. (have to)

3 You aren't allowed to talk in the exam. (mustn't)

4. It's important that you listen to me. (must)

5. You needn't write the answer. (have to)

Read the Learn this! box. Underline the past modal verbs in the dialogue in exercise 1.

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!

Study these sentences. Then complete rules 1-4.

You have to be a really strong swimmer.

I must get really good marks.

I don't have to make a decision right now.

My friends say I should become a nurse.

You mustn't do something you aren't sure about.

I don't need to do an apprenticeship.

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.

Read the Learn this! box. Then look at the highlighted verbs in the text above. Which verb pattern (a-e) does not have an example in the text?

Read the Learn this! box and complete the rules. Use the dialogue to help you. How many examples of this tense are there in the dialogue?

3.I___forget my key,or I won't get in.

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

4.You___go off on your own at night.It's not safe at all.

A.needn't       B.should       C.mustn't        D.must

5.The police told Nick___keep his dog under control or she would definitely hurt somebody in the room.

A.could       B.might     C.can      D.must

(GIÚP MIK VỚI Ạ,MIK ĐANG CẦN GẤP!!!!!!)