Grammarway 4 — Unit 5: Modal Verbs

Exercise 1: Choose the best modal verb.

1. I ___ swim very well now.

2. When I was five, I ___ ride a bike.

3. Next year, she will ___ speak French fluently.

4. You ___ wear a seatbelt in a car.

5. Students ___ do their homework before class.

6. You look tired. You ___ get some rest.

🔑 Đáp án & Giải thích (Exercise 1)

1. can — Dùng 'can' để nói khả năng hiện tại.
2. could — Dùng 'could' cho khả năng trong quá khứ.
3. be able to — Dùng 'be able to' cho khả năng trong tương lai.
4. must — 'Must' diễn tả nghĩa vụ mạnh.
5. have to — 'Have to' diễn tả sự cần thiết.
6. should — 'Should' dùng để đưa lời khuyên.

Exercise 2: Choose the correct answer.

1. You ___ park here. It is forbidden.

mustn't don't have to may could

2. We ___ hurry. There is plenty of time.

don't have to must have got to ought to

3. She studied hard. She ___ pass the test.

should can't mustn't needn't

4. The lights are off. They ___ be at home.

can't must should may

5. Look at those dark clouds. It ___ rain later.

might mustn't have to can

6. He has the key, so he ___ open the door.

can mustn't needn't ought

🔑 Đáp án & Giải thích (Exercise 2)

1. mustn't — 'Mustn't' diễn tả sự cấm đoán.
2. don't have to — Không cần thiết làm việc đó.
3. should — 'Should' diễn tả khả năng cao.
4. can't — Dùng 'can't' để suy đoán điều không thể.
5. might — 'Might' diễn tả khả năng có thể xảy ra.
6. can — 'Can' diễn tả khả năng thực hiện hành động.

Exercise 3: Write the correct modal form.

1. ___ I borrow your pen?

2. You ___ have told me earlier. (criticism)

3. She wasn't ___ to use her phone in class.

4. We are ___ to meet the manager at 10 a.m.

5. The train is ___ to arrive on time.

6. I ___ get up early tomorrow because of work.

🔑 Đáp án & Giải thích (Exercise 3)

1. May — Dùng 'May' để xin phép lịch sự.
2. should — 'Should have' dùng để phê bình việc đã xảy ra.
3. allowed — 'Be allowed to' nói về sự cho phép.
4. supposed — 'Be supposed to' nói về điều được mong đợi.
5. likely — 'Be likely to' diễn tả khả năng xảy ra.
6. have to — 'Have to' diễn tả sự cần thiết.

Exercise 4: Look at the picture and choose the best answer.

Exercise Context — A busy city park on a sunny afternoon. A cyclist is wearing a helmet and riding on a path. A small sign says 'No Dogs on the Grass'. Two children are flying a kite. A woman is helping an elderly man cross a path. A man is reading a map near a fountain. Dark clouds are far away in the sky. Several people are sitting on benches and talking. A park worker is cleaning near a flower bed.

1. The cyclist ___ ride safely because he has a helmet.

2. Dogs ___ go on the grass.

3. The woman ___ be kind because she is helping the elderly man.

4. It ___ rain later because there are dark clouds.

5. People ___ sit on the benches if they want to rest.

6. The man with the map ___ be looking for directions.

🔑 Đáp án & Giải thích (Exercise 4)

1. can — Có khả năng đi an toàn nhờ đội mũ bảo hiểm.
2. mustn't — Biển báo cho thấy điều bị cấm.
3. must — Suy đoán chắc chắn dựa trên bằng chứng.
4. might — Có khả năng trời sẽ mưa.
5. can — Diễn tả sự cho phép hoặc khả năng.
6. could — Suy đoán khả năng có thể xảy ra.

Exercise 5: Choose the correct sentence completion.

1. I finished early, so I ___ stay at the office.

2. You ___ bring food; we already have enough.

3. She ___ have called me; I already knew the news.

4. Employees ___ wear ID cards at all times.

5. You ___ see a doctor about that cough.

6. He ___ be tired after working all night.

🔑 Đáp án & Giải thích (Exercise 5)

1. didn't need to — Không cần làm việc đó trong quá khứ.
2. don't need to — Không cần thiết mang thêm.
3. needn't — Hành động đã làm nhưng không cần thiết.
4. have got to — Nghĩa vụ bắt buộc.
5. ought to — Đưa lời khuyên.
6. must — Suy đoán gần như chắc chắn.

Exercise 6: Choose the best response.

1. ___ you help me with this bag?

Could Must Ought Need

2. ___ we go for a walk after lunch?

Shall Must Need Can't

3. ___ don't we invite Tom to the party?

Why Must Need May

4. ___ I carry that box for you?

Shall Mustn't Needn't Can't

5. ___ I open the window, please?

May Must Ought Need

6. ___ we start the meeting now?

Can Mustn't Needn't Ought

🔑 Đáp án & Giải thích (Exercise 6)

1. Could — 'Could' dùng để yêu cầu lịch sự.
2. Shall — 'Shall' dùng để đưa ra đề nghị.
3. Why — Cấu trúc đưa ra gợi ý.
4. Shall — Dùng để đề nghị giúp đỡ.
5. May — Xin phép một cách lịch sự.
6. Can — Dùng để đưa ra gợi ý đơn giản.

Exercise 7: Write the missing word or phrase.

1. We need to ___ along with our new neighbors. (phrasal verb)

2. I finally got ___ the flu after two weeks.

3. Please get ___ to your homework now.

4. She is keen ___ learning languages.

5. He was impressed ___ the presentation.

6. The teacher's explanation got the idea ___ clearly.

🔑 Đáp án & Giải thích (Exercise 7)

1. get — 'Get along with' = hòa hợp với.
2. over — 'Get over' = hồi phục sau bệnh.
3. down — 'Get down to' = bắt đầu làm nghiêm túc.
4. on — Đi với giới từ 'on'.
5. with — Đi với giới từ 'with'.
6. across — 'Get across' = truyền đạt rõ ràng.