1,had been -> were 

2,Unless -> If

3,knew -> known 

4,am -> were 

5,could find -> found 

6,would stop ->would have stopped 

7,could speak -> spoke 

8,is not -> wasn't 

9,had I known ->I had known 

10,will -> would 

11,be -> been 

12,because -> if 

13, is => were

14,will study -> study 

15,to go ->go

16,to -> for 

17,occur -> would occur 

18,would have studied ->had studied 

19,will be -> is 

20,saw ->see 

1. If Lucia had been here now, she would find out the truth about her uncle's accident.

=> had been thành were
A  B  C  D

2. Unless we leave a bowl of water under the sun, it will evaporate. 
A  B  C  D

=>  Unless thành  if
3. If I had knew the time when the match started, I would have told you. 
A  B  C  D 

=> had knew thành knew
4. If I am 10 centimeters taller, I would play basketball. 

am thành were
A  B  C  D
5. If the doctors could find in the remedy, a lot of people would be saved. 
A  B  C  D

. in thành  out
6. If I had realized that the traffic lights were red, I would stop. 
A  B  C  D 

would stop thành would have stopped
7. What you would do if you could speak French well? 
A  B  C  D

 you would thành would you
8. If I had known he is not at home, I wouldn't have gone all the way to his house. 

is thành was
A  B  C  D
9. If had I known you were in financial difficulty, I would have helped you. 
A  B  C  D

bỏ if
10. If I were you, I will go to the dentist's and have the tooth checked.
A  B  C  D

will thành would
11. If you hadn't left the car unlocked, it wouldn't have be stolen. 
A  B  C  D

be thành been
12. What would happen because I pressed that red button? 
A  B  C  D

because thành if
13. If the weather is fine today, we would go to the beach. 
A  B  C  D

14. If you will study harder, you will surely pass the coming exams with good results. 

bỏ will
A  B  C  D
15. If the weather weren't too bad, we would to go swimming. 
A  B  C  D

bỏ too
16. If he weren't too old, he would apply to the job as a war reporter. 
A  B  C  D

to thành for
17. If drivers obeyed the speed limit, fewer accidents occur.
A  B  C  D

. occur thành  would occur
18. If I would have studied Russian at school, I would have understood him easily.

. would have studied thành had studied
A  B  C  D
19. If tomorrow the weather will be bad, the match will be postponed. 
A  B  C  D

will be thành is
20. If you saw Mike today, please ask him to phone me. 
A  B  C  D

saw thành see

1. had been
2. wouldn't have got
3. would have grown
4. had joined
5. had gone - would have met
6. had tried
7. had written
8. wouldn't have finished
9. hadn't meet - wouldn't have had
10. had had

1. If you (be)had been at home, you would have felt angry 

2. If it had rained harder, i (not get)wouldn't have got back on time 

3. Trees (grow) would have grown faste if the weather had been better

4. we would have had a lot of fun if you (join)had joined in that trip

5. If he (go)had gone to London yesterday, he (meet) would have met his old friend

6. Unless you (try) hadn't tried hard, you couldn't have passed the exmination

7. He must have got good mark if he (write)had written his report more carefully

8. Unless they had made many carefully prepartions, they (not finish)wouldn't have finished the work ferfecthy

9. If you (not meet)hadn't met him last week, you (not have) wouldn't have had enogh money to buy this motorbike

10. He might have borrowed the book if he (have)had had a library card 

Tham khảo

1. had been
2. wouldn't have got
3. would have grown
4. had joined
5. had gone - would have met
6. had tried
7. had written
8. wouldn't have finished
9. hadn't meet - wouldn't have had
10. had had

Exercise 6 : Choose the best answer for each of the following sentences. 1._____have enough apples, she’ll make an apple pie this afternoon. A.Should she B. If she C. Will she D. Unless she 2.If you_____to me, you wouldn’t have got so much trouble. A. listened B. would listen C. had listened D. Would have listened 3.If you don’t know how to spell a word, you_____ look it up in the dictionary. A. must B. will C. should D. ought 4.If the sun _____, we _____for a walk. A. shines / will go B. shone / will go C. shone / would go D. had shone / would go 5.The campfire _____ if it _____ last night. A. wouldn’t be cancelled / hadn’t rained B. wouldn’t have been cancelled / hadn’t rained C. would have been cancelled / hadn’t rained D. will be cancelled / rains 6.But for our parents, we _____ successful in life. A. will never be B. would never be C. wouldn’t have be D. would have never been 7.If I _____ my wallet at home this morning, I _____ money for lunch now. A. leave / will have B. didn’t leave / would have C. hadn’t left / would have D. hadn’t left / would have had 8.It is too bad, Lam isn’t here. If he _____ here, he _____ what to do. A. were / would know B. is / will know C. had been / would have known D. was / would know 9.If we _____ the plans carefully, we would not have had so many serious mistakes. A. study B. had studied C. studied D. were studying 10.I will never talk to you again _____ you apologize me _____ your being rude. A. if / for B. unless / for C. or / of D. whether / or 11._____if you work harder, you will be sacked. A. Whether B. If C. However D. Unless 12.I think you should stop smoking. A. If I am you, I will stop smoking. B. If I were you, I will stop smoking. C. If I were you, I would stop smoking. D. If I had been you, I would stop smoking. 13.If you take the ice out of the fridge, it _____. A. vaporizes B. melts C. heats D. disappears 14.We should do something to protect water from being polluted _____we will have nothing to drink in the future. A. if B. whether C. or D. unless 15.Let’s knock on their door to see _____home. A. if they’re B. unless they’re C. whether they were D. if they were 16.Unless we _____more snow, we can’t go skiing. A. will have B. have C. have had D. had 17.You’ll fail the exam _____ you start revising. A. if B. until C. when D. unless 18.Unless you wash the car, you _____not drive it at the weekend. A. would B. could C. have to D. may 19.If Peter _____his car before the drive, he _____the problem of out of petrol. A. checked / will not get B. had checked / would not have got C. checks / will not have got D. would be checking / will not have got 20.He stepped on the mine, and it exploded. A.If he doesn’t step on the mine, it doesn’t explode. B.If he doesn’t step on the mine, it won’t explode. C.If he didn’t step on the mine, it wouldn’t explode. D.If he hadn’t stepped on the mine, it wouldn’t have exploded. 21. In my experiments, the liquid is cooled to 32ºF. It always freezes. A.If you cool the liquid to 32 degrees, it froze. B.If you cooled the liquid to 32 degrees, it would freeze. C.If you cool the liquid to 32 degrees, it will freeze. D.If you had cooled the liquid to 32 degrees, it would have frozen. 22.It may rain this afternoon. I hope it doesn’t because I don’t want the match to be cancelled. A. If it rains, the match is cancelled. B. If it rains, the match will be cancelled. C. if it rained, the match would be cancelled D. If it had rained, the match would have been cancelled. 23.Unfortunately, I don’t know Philosophy, so I can’t answer your question. A.If I know Philosophy, I can answer your question. B.If I know Philosophy, I will be able to answer your question. C.If I knew Philosophy, I would be able to answer your question. D.If I had known Philosophy, I would have been able to answer your question. 24._____ there are some more ideas, we can end the meeting now. A. If B. As if C. Unless D. In case 25.If he _____with us now, he _____ the beauty of nature of the National Park. A. is / can enjoy B. was / will enjoy C. has been / would enjoy D. were / could enjoy 26.If they had searched more carefully, they...the watch sooner. A. will find B. would find C. found D. would have found 27.If I had got up early, I _____ to have breakfast now. A. have B.I had C. would have D. would have had 28.I cannot buy a new computer _____ I save enough money. A. if B. even if C. unless D. as if 29.Most people you meet will be polite to you _____. A. if you are polite to them B. if you will be polite to them C. unless you are polite to them D. if you were polite to them 30.If you do so, it _____ the matter worse. A. makes only B. would only make C. will only make D. had only made 31.You _____ English fluently unless you practice it every day. A. will speak B. will not speak C. can speak D. did not speak 32.Hurry up _____ you will miss the bus and be late for school. A. if B. and C. or D. as 33.You will get a good seat if you _____ first. A. come B. came C. have come D. will come 34.Sam will not graduate_____. A. if he passed all the tests B. if he does not pass all the tests. C. unless he passes all the tests D. unless he had passed all the tests. 35.If I had time, I would go with you. A.I am free and surely go with you. B.I am too busy to go with you. C. I will go with you because I have time. D. I am free enough to go with you. 36.If Margaret hadn’t been wearing a seat belt, she.... Injured. A. has been B. would has been C. would be D. would have been 37.If I _____ the rain yesterday, I_____ ill. A. had not caught / would have been B. had not caught / would have not been C. have not caught / were not D. have not caught / would have been 38.He looked frightened as if he _____ a ghost. A. sees B. is seeing C. has seen D. had seen 39.What _____if there _____ a serious nuclear accident. A. will happen / was B. happens / were C. would happen / were D. would happen / had been

Lần sau bn vt thì cách ra cho dễ nhìn nhé~~~~

Choose the best answer for each of the following sentences. 1._____have enough apples, she’ll make an apple pie this afternoon. A.Should she B. If she C. Will she D. Unless she

2.If you_____to me, you wouldn’t have got so much trouble.

A. listened B. would listen C. had listened D. Would have listened

3.If you don’t know how to spell a word, you_____ look it up in the dictionary.

A. must B. will C. should D. ought

4.If the sun _____, we _____for a walk.

A. shines / will go B. shone / will go C. shone / would go D. had shone / would go

5.The campfire _____ if it _____ last night.

A. wouldn’t be cancelled / hadn’t rained B. wouldn’t have been cancelled / hadn’t rained C. would have been cancelled / hadn’t rained D. will be cancelled / rains

6.But for our parents, we _____ successful in life.

A. will never be B. would never be C. wouldn’t have be D. would have never been

7.If I _____ my wallet at home this morning, I _____ money for lunch now.

A. leave / will have B. didn’t leave / would have C. hadn’t left / would have D. hadn’t left / would have had

8.It is too bad, Lam isn’t here. If he _____ here, he _____ what to do.

A. were / would know B. is / will know C. had been / would have known D. was / would know

9.If we _____ the plans carefully, we would not have had so many serious mistakes.

A. study B. had studied C. studied D. were studying

10.I will never talk to you again _____ you apologize me _____ your being rude.

A. if / for B. unless / for C. or / of D. whether / or

1 we did not visit the museum because we had no time

a if we have time , we will visit the museum

b if we had time , we would visit the museum

c if we had had time , we would have visited the museum

d if we had had time , we will visit the museum

2 he looked frightened as if he ................

a ghost a sees b is seeing c has seen d had seen

3 ........... resigned , we would have been forced to sack him

a had he not b had not he c he had not d he not had

4 if you ................ me about the bad service , we’d have eaten there

a did not tell b would not have told c had not told d had told

5 the teacher was absent today, so class was canceled . if she ........... absent again tomorrow , class ........ tomorrow,too

a is/will cancel b is / will be canceled c was / would be canceled d was/ would cancel

6 if you .................. to my advice in the first place , you............... in this mess right now

a listen/will be b had listened / would not have been c will listened / would not be d had listened/ would not be

7 if i had been absent from class yesterday , i ............. the math test

a would missed b would have missed c will miss d miss

8 if you ............... here earlier , you ............. her

a had come / would have met b come / meet c came / would meet d comes will meet

9 i think you should stop smoking

a if i am you , i will stop smoking

b if i were you , i will stop smoking

c if i were you , i would stop smoking

d if i had been you , i would stop smoking

10 if i were , i would work harder

a you would rather not work so hard

b you should work harder

c you should work with me

d do not work so hard

1. We could had done more if we had had more time. --> have

2. He said that if he has more time , he would come to see us. --> had

3. While  I did my homework , I had a good idea. --> was doing

4. Don't make so much fusses over the children. --> fuss
5. John's friends had celebrated a  farewell party for him last Sunday. --> celebrated

1, could had ⇒ could have

2, has ⇒ had

3, did  ⇒ was doing

4, fusses  ⇒ fuss

5, had celebrated  ⇒ celebrated

21. Of => in

22. He should => should he

23. Were => had been

24. Unless => if

25. Will be => is

26. Have => had

27. Buying => to buy

28. Not => not to

29. Drinking => drink

30. Quietly => quiet

31. Not => X

32. Would => will

33. Has => had

1. Would try

2. Would make

3. Would have been improved

4. Will continue

5. Will be left

6. Growing up

7. Will go on

8. Stopped

9. Were controlled

10. Wouldn't become

11. Had

12. Would be

13. Will be

Chọn lỗi sai và sửa lại

1. If I (knew )you (were )coming I (would have => would )meet you (at) the airport

2. I (could make )rabbits (disappear) into (thin) air if I (am=>were) a magician

3. (What) (would you have done=> would you done )if you( were )in my position

4. My children( won't go )to bed (unless=> if )they don't (have) (some) money

5. If we( will reduce=>reduce )the speed of( population growth) there will be (less) pressure( on) the earth

6.(had I )knowns (Alice's )address( I would write=> I would have written)( to her)

7.if you( had finished) (the work) you can( go)=> could go( home)

8.(unless )=> ifit (doesn't) rain. Peter will (pay) us( a visit )tomorrow

9.if( had I known=> I had known) you (were) (in) financial difficulty I( would have helped )you

10. If Lucia (had been=> were )here now she( would find out )the truth( about) her (uncle's) accident