không có 1 trong các câu ví dụ trên cũng không sao nha

1 was

2 doesn't

3 was

4 will

5 am - isn't

6 should

7 won't

8 do

9 could

10 would - could - can't

1 may

2 couldn't

3 should

4 must

5 can

6 might

7 Will

8 ought to

Động từ đứng sau đọng từ khuyết thiếu là đọng từ nguyên thể .

VD: I can swim.

Cách dùng của các động từ khuyết thiếu( can, could, have to, must, will, should, ought to, had better, might, will be able to ) là dùng những động từ nguyên thể đứng sau động từ khuyết thiếu đó.

Example: I could ride a bike when I was six.

1. He …….leave early, didn’t he? (must/ had to/ has to/ ought to)

2. His eyes were so bad that he ………..read the number on the board. (shouldn’t/hadn’t to/ couldn’t/ can’t)

3. There’s the waiter. I ……..ask him for the bill. (will/ shall/ am able to/ could)

4. ………….open the door for you? (Would you like that I / Do you want that I /will I / shall)

5. ………..you be able to come to the meeting? – I’m afraid not. (Can/ will/ May/ should)

6. My car broke down so I ………..come by bus. (had to/ must/should/ could)

7. …………….ask you some questions? – OK,go ahead.(shall I / will I / should I /may I )

8. I ………….play tennis than golf. (like better to/ prefer/ ‘d rather/ ‘d better)

9. There are a lot of mistakes in this exercises. I …….. go over it again with you. (will have to/ am able to/ would/ could)

10. He was a good swimmer, so he ………. Swim to the river bank when the boat sank. (could/ can/ would/ was able to)

11. He ……….. live in the country than in the city.(would rather/ had better/ should/ might)

12. You ……….. go now. It’s getting late.(had rather/ had better/ ought/ would rather)

13. You ………..fly to London this evening provided you don’t mind changing planes in Paris.(must/ have to/ can/ ought to)

14. I ……….. to take advantage of this opportunity to thank for your co-operation. (would like/can/ am able to/ might)

15. You …………..add it up. I’m not good at figures.(have to/ ought to/ ‘d better/ both b and c)

- Động từ khiếm khuyến “can” thường dùng để diễn tả về một khả năng

Ex: I can speak 4 languages: english, spanish, russia and french
(Tôi có thể nói bốn thứ tiếng: tiếng Anh, tiếng Tây Ban Nha, tiếng Nga và tiếng Pháp)

- Thể phủ định “can’t” diễn tả một điều không thể, không có khả năng thực hiện

Ex: I can’t love him even he gave me all his money
(Tôi không thể yêu anh ta dù cho anh ta đã cho tôi tất cả tiền bạc)

- Thể nghi vấn dùng để xin phép hoặc một sự yêu cầu

Ex: Can I use your cell phone?
(Tôi có thể dùng điện thoại của bạn không?)

Can you help me, sir?
(Thưa ngài, ngài có thể giúp tôi không?)

- “Could” có thể được dùng để xin phép

Ex: Could I borrow your motobike for 2 hours?
(Tôi có thể mượn xe máy của bạn trong 2 tiếng đồng hồ không?)

- Đưa ra một yêu cầu

Ex: Could you turn the light off?
(Bạn có thể tắt đèn không?)

- Đưa ra một lời đề nghị

Ex: We could go out for dinner tonight
(Chúng ta có thể ra ngoài ăn tối nay)

- Một khả năng trong tương lai

Ex: I think we could have another house in future
(Tôi nghĩ chúng ta sẽ có một căn nhà khác trong tương lai)

- Một khả năng trong quá khứ

Ex: I broke up with Daina so I could have a new love
(Tôi đã chia tay với Daina nên tôi có thể có một tình yêu mới)

- “May” dùng để đưa ra sự xin phép

Ex: May I have another glass of orange juice?
(Có thể lấy cho tôi một ly nước cam khác không?)

- Diễn tả khả năng trong tương lai

Ex: China may become a major economic power
(Trung Quốc có thể sẽ trở thành một cường quốc về kinh tế)

- Đưa ra một yêu cầu giúp đỡ

Ex: May I help you something, madam?
(Tôi có thể giúp gì cho bà không, thưa phu nhân?)

Choose the best option for each sentences:

1. Laura, you and the kids just have dinner without waiting for me. I......work very hard today.

A. Can B. May C. Should D. Would

2. I........ be delighted to show you round the factory.

A. Ought to B. Would C. Might D. Can

3. Leave early so that you....... miss the bus.

A. Didn’t B. Won’t C. Shouldn’t D. Mustn’t

4. Jenny’s engagement ring is enormous!!’ It....... have cost a fotune

A. Must B. Might. C. Will. D. Should

5. You....... to write them today

A. Should. B. Must. C. Had D. Ought

6. I hope i......... fin it

A. Will. B. Shall. C. Could. D. Must

7. Unless he runs he...... catch the train

A. Will. B. Mustn’t. C. Wouldn’t. D. Won’t

8. .......... you be in Rome tonight.

A. Will. B. May. C. Might. D. Maybe

9. We....... have time to help you tomorrow.

A. May. B. Must. C. Will D. Could

10. “........ you hand me that pair of scissors, please?”

A. May. B. Will. C. Shall. D. Should

1. Laura, you and the kids just have dinner without waiting for me. I......work very hard today.

A. Can B. May C. Should D. Would

2. I........ be delighted to show you round the factory.

A. Ought to B. Would C. Might D. Can

3. Leave early so that you....... miss the bus.

A. Didn’t B. Won’t C. Shouldn’t D. Mustn’t

4. Jenny’s engagement ring is enormous!!’ It....... have cost a fotune

A. Must B. Might. C. Will. D. Should

5. You....... to write them today

A. Should. B. Must. C. Had D. Ought

6. I hope i......... fin it

A. Will. B. Shall. C. Could. D. Must

7. Unless he runs he...... catch the train

A. Will. B. Mustn’t. C. Wouldn’t. D. Won’t

8. .......... you be in Rome tonight.

A. Will. B. May. C. Might. D. Maybe

9. We....... have time to help you tomorrow.

A. May. B. Must. C. Will D. Could

10. “........ you hand me that pair of scissors, please?”

A. May. B. Will. C. Shall. D. Should

1: when my farther was young , he ….... work in the garden for long hours

A: can B: could C: will D: should

2: He ........ have comminitted the crime because he was with me that day

A: must B: shouldn't C: won't D: couldn't

5: Since we have to there by 8.30 , we ........ take a taxi

A: Had better B: May C: ought. D : are able to

6: It ...... rain this evening . Why don't you take an umbrelly ?

A: could be B: must C: might. D : will

7: ....... you help me with the homework ?

A: may. B: shall. C: should. D: will

8: she hasn't eaten anything since yesterday. She..... be really hungry

A: might. B: will. C: must. D : can

9: I put my keys on the table, but now it's gone. Someone.....have taken it

A: may. B: had to. C: should. D: would rather

10: Daisy is reading her English test because she has a test tomorrow. She .....be studying

A: will. B: should. C: must. D: can

11: We ....... put the fish in the fridge before it spoils

A: had to B: may. C: can. D: had better

1: when my farther was young , he ….... work in the garden for long hours

A: can B: could C: will D: should

2: He ........ have comminitted the crime because he was with me that day

A: must B: shouldn't C: won't D: couldn't

5: Since we have to there by 8.30 , we ........ take a taxi

A: Had better B: May C: ought. D : are able to

6: It ...... rain this evening . Why don't you take an umbrelly ?

A: could be B: must C: might. D : will

7: ....... you help me with the homework ?

A: may. B: shall. C: should. D: will

8: she hasn't eaten anything since yesterday. She..... be really hungry

A: might. B: will. C: must. D : can

9: I put my keys on the table, but now it's gone. Someone.....have taken it

A: may. B: had to. C: should. D: would rather

10: Daisy is reading her English test because she has a test tomorrow. She .....be studying

A: will. B: should. C: must. D: can

11: We ....... put the fish in the fridge before it spoils

A: had to B: may. C: can. D: had better

1, You just have dinner without waiting for me. I (can, may,should,would) worl very hard today.

2,I (ought to, would,might,can) be delighted to show you round the factory.

3,Leave early so that you (didn't, won't, shouldn't, mustn't) miss the bus.

4,Unless he runshe (will, mustn't, wouldn't,won't) catch the train.

5, (will, may, might,maybe) you be in Rome tonight.

6, Jeanette did very badly on the exam. She (must have studied,should have studied, could have studied) harder

1, You just have dinner without waiting for me. I (can, may,should,would) worl very hard today.

2,I (ought to, would,might,can) be delighted to show you round the factory.

3,Leave early so that you (didn't, won't, shouldn't, mustn't) miss the bus.

4,Unless he runs,he (will, mustn't, wouldn't,won't) catch the train.

5, (will, may, might,maybe) you be in Rome tonight.

6, Jeanette did very badly on the exam. She (must have studied,should have studied, could have studied) harder

16. the phone has been ring ing for a minute. Noone …………at home(must have been/ can have been/ should have been/ none of these)
17. she’s fainted. Throw some water on her face and she ………. Come round.(has to/ may/ must/ can have)
18. ………..you please refrain from smoking while the lecture is in progress? (May/ Might/ Would/ Should)
19. I ……………… persuade him as I said.(wasn’t able to/ can’t/ mustn’t/ ought not)
20. I’m sorry to bother you while you’re working, but I …………ask you a question.(can/ had to/ must/ may)
21. He couldn’t have mean it seriously. He ……….laughed at you. (would/ couldn’t/ had/ must have)
22. we …….ensure the telegram arrives in time. (had to/ must/ ‘d rather/ might)
23. he ……..keep his family because his wages were too low. (couldn’t/mustn’t/ can’t/ didn’t have to)
24. the sea was too rough that we …………swim. (couldn’t/can’t/won’t/wouldn’t)
25. …………make an appointment to see the doctor? (May I / Could I / Will I/ Shall I )
26. Perhaps there ………. A good pro gram on the radio. (might be/ will be/ can be/ should be)
27. I ……go swimming when I was young. (a. could/b.would./ c. used to/d. both b and c)
28. ………..take this letter to the post office, please?(May you/ Must you/ Would you/none of these)
29. in our family my father ………sit at the top of the table. (used to/ had to/ ought to/must)
30 Do it as well as you ……………. (must/ will/ can/ have to)
31. I …………swim in this water: it is much too cold.(mightn’t/ mustn’t/ can’t/ don’t have to)

32. you …………… imagine my surprise when I heard the news. (can/ ought to/ will/ all of these)
33. you do some work instead of sitting there reading the paper. (would rather/ ought to/ won’t/ don’t have to)
34. be careful how you hold that jug; it ……….break easily.(may/ ought to/will/ might)
35. I’m not sure where to go for my holiday, but I ……..go to China. (should/ may/ have to/ needn’t)
36. we had free tickets, so we ……….pay to get into the concert. (didn’t have to/ couldn’t/mustn’t/ shouldn’t