Đáp án
Can

Từ khóa
Diễn tả khả năng có thể thực
hiện trong hiện tại hoặc tương
lai.

Ví dụ

-

You can speak
spanish.
I can help you next
week.

Giải thích

+
+

Can, Could dùng trong câu đề nghị, xin
phép, yêu cầu; could thể hiện sự lịch sự hơn
so với can.
Could you wait a minute?
Can I ask you a question?
Có thể dùng “be able to” thay cho “can”
hoặc “could”

Could

Diễn tả khả năng có thể
thực hiện trong quá khứ

My brother could peak
Engish when he was five.

Must

-

Diễn tả sự cần thiết, bắt
buộc ở hiện tại, tương lai;
sự bắt buộc đến từ người
nói.
- Đưa ra lời khuyên hoặc
suy luận mang tính chắc
chắn, đặc biệt là suy luận về
việc
trong quá khứ.
Diễn tả sự cần thiết phải làm
(tính khác quan, từ yếu tố
bên
ngồi tác dộng…)

-

I have to stop smoking. (my
doctor said that.)


Don’t have to = Don’t need to chỉ sự không cần
thiết

Diễn tả khả năng sự việc có
thể xảy ra trong hiện tại
hoặc
tương lai.

It will rain tomorrow.

-

Have to

May

-

You must get up early in
the morning.
You must huungry
after working hard.
She must have been
upset when she got the
news.

-

Mustn’t chỉ sự cấm đốn


+

+

+
Might

Diễn tả điều gì có thể đã xảy
ra ở quá khứ.

She might not be in his
house.

Would

Diễn tả dự đốn việc có thể
xảy ra trong q khứ.

She would be upset when
hearing the bad news.

Dùng để xin ý kiến lời
khuyên.

Where shall we eat
tonight?

-

-


Shall

Should

Ought to

Need

Chỉ sự bắt buộc hay
bổn phận (ở mức độ
nhẹ hơn “Must”).
- Đưa ra lời khuyên nói
chung.
- Dùng đẻ suy đoán.
- Chỉ sự bắt buộc, mạnh
hơn “Should” nhưng
nhẹ hơn “Must”.
- Đưa ra lời khuyên, kiến
nghị mang tính giải pháp.
Chỉ sự cần thiết phải
làm gì.

You should send this
report by 8th September.
- You should call her.
- She worked hard, she
should get the best
result.
- You ought not to eat

candy at night.
- There ought to be some
street lights in our
neighbourhood.
You need finish that
work today.

May, might chỉ sự xin phép
May I turn on TV?
Might dùng ở câu gián tiếp.
I wonder if he might go there alone.
Might được dùng như May
He may/might go out with his friends.

Shall được sử dụng với ngôi
We, I

Ought to có thể được sử dụng khi nói về một
nhiệm vụ hoặc một điều luật.


Had
better
Be able to

Đưa ra lời khuyên,
kiến nghị cho 1 tình huống cụ
thể ở tình huống hiện tại
hoặc tương lai.
- Có thể thay thế cho can

hoặc could
- Khi đề cập tới những
thành tích, những khả
năng , những sự việc chỉ
có thể đạt được nếu có sự
chuẩn bị, sự luyện tập
hay sự cố gắng nhất định.

You had netter not go
out late at night.

Thường không sử dụng dạng
nghi vấn với had better.

-

-

I can play football
= I am able to play football.
- She could singing
English songs when she
was five.
= She was able to sing
English songs when she
was five.
- The fire spread through
the building quickly but
evetybody was able to
escape. (không dùng

‘could escape’)

Khi dùng ở các thì khác ngồi hiện tại (can)
và q khứ (could) cần dùng be able to:
- I can’t sleep.
- I haven’t been able to sleep recently.
(không dùng can)
- Be able to không dùng với các động từ như:
see, hear, smell, taste, feel, remember,
understand, chỉ dùng can/ could
When we went into the house, we could smell
something burning. (không dùng “were able to
smell”).

1. S + should (not)/ought (not) to + have + PPII (đáng lẽ đã phải/ nên): Chỉ một
việc nên/ không nên làm ở quá khứ.

2. S + must have + PPII (chắc hắn là đã): Chỉ suy luận logic dựa trên sự việc xảy ra
ở quá khứ ở dạng câu khẳng định.

3. S + can’t/couldn’t + have + PPII (không thể đã): Dùng để chỉ một sự việc chắc
chắn không thể xảy ra ở quá khứ.

4. S + could/ may/ might + have + PPII/been + V-ing (có thể là đã): Chỉ một sự việc
có thể xảy ra ở quá khứ.

5. S + needn’t have + PPII (đã không cần phải): Diễn tả một hành động khơng cần
xảy ra ở q khứ
Nghĩa
Có thể

Cấm
Nên
Cần

Phải ()

Từ (câu gốc)
Possible/ likely/ able
/ perhaps
Impossible/ probable
not compulsory
Not allowed
Against rule
Advice/ advise/ advisable
It … careless
It’s time/ it’s mistake
(not) necessary/ unnecessary
(not) essential
(not) important
(not) vital
Compulsory/obligatory/ mandatory
Require/ request
According to rules/ law
Is/ am/ are + Sure
Was/ were + Sure

Modal verb (đáp án)
Can/ could/ may might
Can/ could/ may might + not
Mustn’t

Should/ had better/ ought to
Should not
Need (not)

Must/ have to
Must + Vo
Must have Vpii

Question 1. It is possible that my school basketball team will lose the game.
A. My school basketball team should win the game.
B. B .My school basketball team need not win the game.
C. My school basketball team must win the game.
D. My school basketball team may not win the game.
Question 2: It is possible that she will not arrive at the party on time
A. She may not arrive at the party on time
B. She mustn’t arrive at the party on time
C. She should arrive at the party on time.
D. She doesn’t have to arrive at the party on time.
Question 3: It is against the school rules to cheat in exams.
A. You must not cheat in exams because it is against the school rules.


B. You don’t have to cheat in exams because it is against the school rules.
C. You needn’t cheat in exams because it is against the school rules.
D. You oughtn’t to cheat in exams because it is against the school rules.
Question 4: It isn’t necessary for us to get a visa for Singapore.
A. We mustn’t get visa for Singapore. B. We needn’t get a visa for Singapore.
B.
We can get a visa for Singapore. D. We shouldn’t get a visa for Singapore.
Question 5: I’m sure this isn’t the type of house that Tom is looking for.

A. This can’t be the type of house that Tom is looking for.
B. This must be the type of house that Tom is looking for.
C. This shouldn’t be the type of house that Tom is looking for.
D. This could be the type of house that Tom is looking for.
Question 6: You’d better go home now before the rain starts.
A. You should go home now before the rain starts.
B. You would go home now before the rain starts.
C. You mustn’t go home now before the rain starts.
D. You needn’t go home now before the rain starts.
Question 7: It is necessary for you to finish this work today.
A. You can’t finish this work today.
B.You mustn’t finish this work today.
C. You may finish this work today.
D.You need finish this work today.
Question 9: There’s now no possibility that he will pass the driving test.
A. He might pass the driving test easily. B. He needn’t pass the driving test.
C. He can pass the driving test easily.
D. He may not pass the driving test.
Question 10: I will probably do well in my next English test.
A. I will have to do well in my next English test.
B. I must do well in my next English test.
C. I will definitely do well in my coming English test.
D. I might do well in my coming English test.
Question 11: I am sure it’s not Emma that you saw at the party last night as she went to the movies with me.
A. You might not have seen Emma at the party last night as she went to the movies with me.
B. You mustn’t have seen Emma at the party last night as she went to the movies with me.
C. You needn’t have seen Emma at the party last night as she went to the movies with me.
D. You couldn’t have seen Emma at the party last night as she went to the movies with me.
Question 12. There's no way that boy is Simon because he's much taller!
A. That boy must be Simon because he's much taller! B.That boy may not be Simon because he's much taller!

C.That boy could be Simon because he's much taller! D.The boy can't be Simon because he's much taller!
Question 13: It’s possible that Newton has got lost.
A. There’s possibility that Newton will get lost. B. Newton may well have got lost
C. Newton was highly likely to get lost
D. Newton must have gone lost.
Question 14: It is very likely that we will arrive before dark.
A. We need arrive before dark.
B. We should arrive before dark.
C.We may arrive before dark.
D. We would arrive before dark.
Question 15: Cheating is not allowed in the GCSE.
A. You may cheat in the GCSE. B. You mustn’t cheat in the GCSE.
B.You don’t have to cheat in the GCSE. C.You should cheat in the GCSE.
Question 16: John was not here yesterday. Perhaps he was ill.
A. John needn’t be here yesterday because he was ill.
B. Because of his illness, John shouldn’t have been here yesterday.
C. John might have been ill yesterday, so he was not here.
D. John must have been ill yesterday, so he was not here.
Question 17. I should have finished the essay last night, but I was exhausted. A. I
finished the essay last night because there was nothing else to do.
B. I tried to finish it last night, but the essay was too tiring.
C. I couldn't finish the essay last night because I was very tired.
D. I finished the essay last night because I was extremely bored.


A.

A.
B.
C.

D.

Question 18: It isn’t necessary for my brother to spend all the afternoon preparing his old bike. A. My
brother mustn’t spend all the afternoon preparing his old bike.
B. My brother can’t spend all the afternoon preparing his old bike.
C. My brother needn’t spend all the afternoon preparing his old bike.
D. My brother might not spend all the afternoon preparing his old bike.
Question 19: It isn't necessary to submit my assignment today.
A. I must submit my assignment today.
B. I needn't submit my assignment today.
C. I could submit my assignment today.
D. I shouldn’t submit my assignment today.
Question 20: It was a mistake of you to lose your passport.
A. You needn't have brought your passport.
B.You shouldn't have lost your passport.
C. Your passport must be lost
D. There must be a mistake in your passport
Question 21: I’m sure it wasn’t Charles you saw yesterday because he was staying with me at that time.
A. It mightn’t be Charles you saw yesterday because he was staying with me at that time.
B.It mustn’t have been Charles you saw yesterday because he was staying with me at that time.
C.It shouldn’t be Charles you saw yesterday because he was staying with me at that time.
D.It can’t have be Charles you saw yesterday because he was staying with me at that time.
Question 22: She probably buys this house next week.
She mustn’t buy this house next week. B. She needn’t buy this house next week.
C.She may buy this house next week.
D. She should buy this house next week.
Question 23: It is high time you made up your mind.
A. You ought to make up your mind now. B. Making up your mind is necessary.
C.It is possible to make up your mind. D. You should have made up your mind.
Question 24: I was late yesterday because I hadn’t been informed about the change of the meeting’s time .

Someone needn’t have informed me that the time of the meeting had been changed .
Someone may have informed me that the time of the meeting had been changed.
Someone should have informed me that the time of the meeting had been changed.
Someone must have informed me that the time of the meeting had been changed .
1. Jeanette did very badly on the exam. She _____ harder.
a. must have studied

b. should have studied

c. could have studied

d. must studied

2. He was very lucky when he fell off the ladder. He _____ himself.
a. could have hurt

b. should have hurt

c. must have hurt

d. will have hurt

3. Marcela didn't come to class yesterday. She _____ an accident.
a. should have had

b. might have

c. must have

d. may have had


3. John still hasn't come out. He ______ everything for the trip now.
a. must have been preparing

b. will be preparing

c. must be preparing d. will have prepared

4. Thomas received a warning for speeding. He _____ so fast.
a. shouldn't have driven

b. would have driven

c. should have

d. might have driven

5. The photos are black. The X-ray at the airport _____ them.
a. should have damaged

b. would have damaged

c. would damage

d. must have damaged

6. Tom didn't do his homework, so the teacher became very angry. He _____ his homework.


a. must have done


b. should have done c. might have

d. will have done

7. My car stopped on the high way. It _____ out of gas
a. may run b. may have run

c. must be

d. should have run

8. Robert arrived without his book. He _____ it.
a. could have lost

b. should have lost

c. would have lost

d. will have lost

9. "Where do you think Rooney is today?". "I have no idea. He _____ late."
a. should have left

b. would have sleep

c. would sleep d. may have sleep

10. Barbate painted his bedroom black. It looks dark and dreary. He _____ a different color.
a. had to choose


b. should have chosen

c. must have chosen

d. could have been choosing

11. The children _____ "thank you" to you when you gave them their gifts.
a. will have said

b. must say

c. should have said

d. should say

11. If we had known your new address, we _____ to see you.
a. came

b. would have come

c. will come

d. would come

12. These two boys look identical. They _____ twins.
a. must have been

b. must be


c. should be

d. should have been