Modal verb

Saturday, September 10th 2022
Vocabulary

CONTENTS
Must, have to

03

Should, ought to

02

02
Form: should/ought to + V(bare_infinitive): nên làm gì

We use “should or ought to” to give our opinion about something or advice to somebody. We can use “ought to” instead of “should”

Ex: You should/ought to finish your homework before you go out

But

“Should” thường dùng khi chúng ta muốn biểu đạt quan điểm, ý kiến cá nhân

Ex: I think you should see him

Trong câu hỏi should được dùng nhiều hơn ought to

Ex: what should I do if I have any problem?

“Ought to” thường được dùng khi nói đến điều luật, nhiệm vụ và quy định

Ex: They ought to follow the school's policy or the will get expelled
Form: Must, Have to + V(bare_inf): phải làm gì

We use “must, have to” to express obligation or the need to do sth. We can use “have to” instead of “must”

Ex: I must/have to go out now.

But

Must: mang tính chất cá nhân, diễn tả sự bắt buộc đến từ người nói, cảm giác cá nhân minh. Người nói thấy đó là điều cần thiết phải làm.

Ex: I really must give up smoking

Have to: không mang tc cá nhân, diễn tả sự bắt buọc từ yếu tố ngoại cảnh như luật lệ, quy định

Ex: you can't turn right here. You have to turn left
“Must” có thể dùng để nói về hiện tại và tương lai, không dùng “must” ở quá khứ, thay vào đó ta sẽ dung “had to” (have to dùng ở mọi thì)

Ex: I must go to school tomorrow

I had to go to school yesterday.

Mustn't: không được làm gì đó (chỉ sự cấm đoán)

Ex: You mustn't tell the truth

Don't have to = don't need to : không cần làm gì, không phải làm gì (nhưng bạn muốn làm thì có thể)

Ex: you don't have to get up early
Exercise 1: Choose the best option in the bracket to complete the sentences.

1. Yesterday I (must/ mustn't/ had to) finish my English project.

2. He will (must/ have to/ has to) wait in line like everyone else.

3. We (must be/ mustn't / have to) on time for work.

4. We (have to not/ must/ mustn't) forget to take the chicken out of the freezer.

5. If you are under 15, you (have/ must/ mustn't) to get your parents' permission.

6. Your child may (have to/ had to/ must) try on a few different sizes.

7. The doctor (must/ mustn't/ have to) get here as soon as he can.

8. Do you (have to/ must/ mustn't) work next weekend?

9. Bicyclists (mustn't/ must/ has to) remember to signal when they turn.

10. Susan, you (mustn't/ must/ have to) leave your clothes all over the floor like this.
Exercise 2: Choose the best answer (A, B, C or D) to complete the following sentences.

1. You__________use your mobile phone in the exam.

A. oughtn\'t to B. mustn\'t C. don\'t have to D. shouldn\'t

2. My grandparents live in the suburb. Therefore, whenever we visit them, we__________a bus.

A. must take B. should take C. have to be taken D. have to take

3. We__________smoke on the bus.

A. mustn\'t B. can\'t C. needn\'t D. mightn\'t

4. There are a lot of tickets left, so you__________pay for the tickets in advance.

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

5. We couldn\'t find a hotel room so we__________sleep in the car.

*might B. should C. had to D. could

6. You\'ll__________tell the police that your house was broken into.

A. should B. must C. have to D. had to
Exercise 3: Choose the best option to complete the sentences.

1. When we were at school we (ought to/ had to/ must) wear a uniform.

2. You (don't have to/ mustn't/ ought not to) be an expert to use the basic functions of program.

3. I (mustn't/ don't have to/ shouldn't) wear glasses. I still can see perfectly well.

4. We went to bed right after dinner because we (had to/must/should) get up early the following day.

5. We (must/ can't/ should to) go for a drink one day.

6. You (hadn't to/ didn't have to/ shouldn't) take any money. I have enough for both of us.
PART 02

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