1. would -> will

2. won’t -> will

3. had had -> would have had

4. bought -> buys

5. stayed -> had stayed

6. would -> won’t

7. review -> reviewed

8. wanted -> want

III.

1.can't →won't

2.  can → could

3. could → can

4. working → to work

5.  won't → wasn't

C. READING 

I.

1.automobile

2.assembly line

3.jobs

4.sensors safer

5.performing

1.     Do your exercises or you will fail the exam.

=> If you don’t do your execises, you will fail the exam.

2.     Save some money or you won’t be able to buy the house.

=> If you don't save some money, you won’t be able to buy the house.

3.     Behave yourself or your parents will be very unhappy.

=> If you don't behave yourself, your parents will be very unhappy.

4.     Do it carefully or you’ll feel sorry afterwards.

=> If  you don't do it carefully, you’ll feel sorry afterwards.

5.     Ask him first or he won’t offer to help.

=> If you don't ask him first, he won’t offer to help.

6.     Be calm or you’ll make a wrong decision.

=> If you aren't came, you’ll make a wrong decision.

7. Be careful or you’ll cut yourself with that knife.

=> If you aren't careful, you’ll cut yourself with that knife.

8. Concentrate on your teacher’s lecture, or you won’t understand the lesson.

If you don't concentrate on your teacher’s lecture, you won’t understand the lesson.

9. They have to drive carefully; otherwise, they will have an accident.

If they don't drive carefully, they will have an accident.

10. Your sister must finish her homework, or she will be punished.

If your sister doesn't finish her homework,  she will be punished.

11. We should do exercises regularly so that we will be in good shape.

If we do exercises regularly, we will be in good shape.

12. Take part in outdoor activities, and you will widen your knowledge.

If you take part in outdoor activities,  you will widen your knowledge.

13. We should eat sensibly so that we won’t gain weight.

If we eat sensibly, we won’t gain weight.

14. You should study English well, and you will have many opportunities for good jobs.

If you study English well, you will have many opportunities for good jobs..

15. Your parents have to control their temper, or they will punish you severely.

If your parents don't control their temper, they will punish you severely.

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

26-Your parents will be happy if you (get).... get...good marks.

27-If you had told Mark the answer, he(pass)…would have passed…..the test.

28-What would you do if you (be)........were.. a teacher ?

29-I (find) .....would have found...the house easily if he had given me the correct address.

30-If the sun hadn't been shining, we (not go).……wouldn't have gone.

31- What will happen if your parents (come) ...come...back?

32-If we have enough money, we (go)....will go.....to the beach.

33-Mark wouldn't have been injured if he (not drive) ..........hadn't driven.. ....too fast.

34- The baby will wake up if you (speak) ......speak.. louder.

---------------------------------------------------------------------------------------

*Câu điều kiện loại 1

-Diễn tả điều có thể xảy ra ở hiện tại hoặc tương lai

-Cấu trúc: If+S+V(s/es), S+will/can+V(infinitive)

*Câu điều kiện loại 2

-Diễn tả điều không thể xảy ra ở hiện tại hoặc tương lai

-Cấu trúc: If+S+V(quá khứ đơn), S+would/could+V(infinitive)

*Câu điều kiện loại 3:

-Diễn tả điều không thể xảy ra ở quá khứ

-Cấu trúc: If+S+had PII, S+would/could+have PII

*Câu điều kiện hỗn hợp

-Kết hợp loại 2 và loại 3: If+S+V(quá khứ đơn), S+would/could+ have PII

-Kết hợp loại 3 và loại 2: If+S+had PII, S+would/could+V(infinitive)

\(\text{#♪◈₰♣}\)

1. If Mr. Harris single, I could introduce him your sister.

a. had been b. were c. would be d. is

2. If you don’t keep the receipt, the shop you a refund.(won't give)

a. wouldn't give b. wouldn't have given c. do you choose d. you would choose

3. If someone offered you those books, which one ?

a. would you choose b. did you chose c. do you choose d. you would choose

4. I feel so hopeless. If only I the language.

a. could speak b. speak c. had spoken d. b or c

5. Tom, I would refuse.

a. If I b. If were I c. Am I d. Were I

6. If only David had been a bit ore careful, _ have been all right.

a. would b. he'd c. he would d. b or c

7. very upset if you turn down his offer of help.

a. Is b. He'll be c. Will be d. He would be

8. If you see Tom tomorrow, him to ring me?

a. do you ask b. must you ask c. ought you ask d. could you ask

9. If they _ the museum, we'd better go there today.

a. haven't seen b. didn't see c. don’t see d. a or c

10. If I , I would have to thank all of you.

a. am to succeed b. were to succeed c. succeeded d. b or c

11. If you for another night, I'll ask the manager to give you a better room.

a. stay b. stayed c. are staying d. will stay

12. If along, I might have died.

a. not came b. hadn't come c. he hadn’t come d. hadn't he come

13. to apologize now, I would forgive her.

a. If she were b. Were she c. She were d. a or b

14. If I could speak Spanish, I next year studying in Mexico.

a. will spend b. had spent c. would spend d. would have spent

15. If energy inexpensive and unlimited, many things in the world would be different.

a. is b. were c. will be d. would be

16. If you _ to my advice in the first place, you wouldn't be in this mess right now.

a. listen b. will listen c. listened d. had listened

17. more help, I could call my neighbour.

a. Should I need b. Needed c. I have needed d. I should need

18. I didn't know you were asleep. Otherwise, I in the room, I would have been killed.

a. don’t make b. didn't make c. won't make d. wouldn't have make

19. If you _ to talk loudly, I will have to ask you to leave.

a. continue b. continued c. will continue d. could continue

20. A huge tree crashed through the roof and broke my bed, in the room, I would have been killed.

a. Should I be b. Had I been c. Would I been d. Would I have been

Choose the best answer for each of the following sentences.
1. 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.

2. 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.

3. 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.

4. ______ there are some more ideas, we can end the meeting now.
A. If
B. As if
C. Unless
D. In case

5. 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

6. If they had searched more carefully, they _____ the watch sooner.
A. will find
B. would find
C. found
D. would have found

7. If I had got up early, I _______ to have breakfast now.
A. have
B. had
C. would have
D. would have had

8. I cannot buy a new computer ____ I save enough money.
A. if
B. even if
C. unless
D. as if

9. 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

10. If you do so, it _____ the matter worse.
A. makes only
B. would only make
C. will only make
D. had only made

11. You ______ English fluently unless you practice it every day.
A. will speak
B. will not speak
C. can speak
D. did not speak

12. Hurry up ______ you will miss the bus and be late for school.
A. if
B. and
C. or
D. as

13. You will get a good seat if you ______ first.
A. come
B. came
C. have come
D. will come

14. 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