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1) It is late now; I don't think Ann will come to see us
-> I would be surprised if Ann came to see us.
2)We don't go on holiday because we don't have enough money
-> If we had enough money, we would go on holiday.
3) Do these exercises more carefully or you will fail the exams
-> Unless you do these exercises more carefully, you will fail the exams.
4) I do not know the answer so I can not tell you
-> If I knew the answer, I could tell you.
5) She can't apply for the job because she doesn't know French
-> If she knew French, she could apply for the job.
6) if she didn't come here now, we'd come back home
-> Unless she came here now, we'd come back home.
7) Be careful or you will not be able to get the job
-> Unless you are careful, you will be able to get the job.
8) The trees will die unless it rains soon
-> If it doesn't rains soon, the trees will die.

1. If you don't see that film, you'll be sorry.
>> unless you see that film, you'll be sorry.
2. If you don't take morning exercises, you will be weak .
>> Unless you take morning exercises, you will be weak .
3. You will ger lost if you don't take a map with you.
>> Unless you take a map with, you will get lost .
4. They will kill him if he doesn't tell them the truth.
>> Unless he tells them the truth, they will kill him.
5. If we don't protect the forests, the environments will be so destroyed.
>> Unless we protect the forests, the environments will be so destroyed.
6. I will wait for her if she calls me.
>> Unless she calls me, I will not wait for her.
Còn lại làm tương tự nhé :))

1.if you don't take good care of it, the car breaks down so often
2.if you hurry up, you won't be late
3.if she were very busy, she couldn't help me now
4.if the weather weren't snowny, the children could go to school
5.if you take exercise, you will be fit
6.if you were careful, you would't cut yourself with that knife
7.unless i had time, i would't help you
8.unless you leave me alone, i will call the police
9.if he drives carefullly, dick doesn't often cause accidents
10.if i knew english, i could apply for that job
11. unless you tell me the whole truth, i will help you
12. unless they invited me, i wouldn't come

1 he can not go out because he has to study for his exam
=> if he doesn't have to study for the exam, he can go out.
2 she is lazy so she can not pass the exam
=> if she isn't lazy, she can pass the exam.
3 he will pay me tonight , i will have enough money to buy a car
=> if he pays me tonight, I will have enough money to buy a car.
4 he smokes too much , that is why he can not get rid of his cough
=>if he doesn't smoke too much, he can not get rid of his cough.
5 she is very shy , so she does not enjoy the pary
=>if she isn't shy, she will enjoy the party.
(Tớ làm 5 câu thôi, mấy câu sau cậu tự làm nhé)

11 i didn't eat lunch , i feel hungry now
=>if i had eaten lunch, I wouldn't have been hungry now
12 it hadn't rained , we would have a better crop
=>but for the rain, we would have a better crop
13 i only come if they invite me
=> unless they invite, I won't come
13 he didn't revise all his lessons , he failed the exam
=>if he had rivised all his lessons, he wouldn't have failed the exam
14 his sister sent her money , so he continued to study
=>but for his sister's money, he wouldn't have contrinued to study
15 the park is over there , only 5 minutes walk
=>if you walk for 5 minutes, you will find the park
16 in case it rain , we'll stay at home
=> if it rains, we'll stay at home
17 let me give you my advice . you should cut down on smoking right now
=> if i were you, I would cut down on smoking right now
18leave me alone or i'll call the police
=>unless you leave me alone, I won't call the police
19 if you arrive at the office earlier than i do , please turn on the air -conditioner
=> should you arrive at the office earlier than I do, please turn on the air-conditioner
\20 the children don't go to school in the snowy weather
=>if it doesn't snow, the children will go to school
21` he died so young otherwise , he would be a famous musician by now
=> had it not been for his dead, he would have been a famous musician by now
22 you must tell me the whole truth or i won't help you
=> unless you tell me the whole truth, I will help you
23 the car breaks down so often because you don't take good care of it
=> were i take good care of it, the car wouldn't break down so often
Nếu không hiểu câu nào thì bình luận ngay ở đây để mình giải thích chi tiết nhé.

11, If I had eaten lunch , I would feel hungry now
12, But for rain , we would have a better crop
13, Unless they invite me, I won’t come
13, If he had revised all his lessons, he wouldn’t have failed the exam
14, But for his sister’s money, he wouldn’t have continued to study
15, If you walk to the park, it will take you 5 minutes
16, If it rains, we’ll stay at home
17, If I were you, I would cut down on smoking right now
18, Unless you lave me alone , I'll call the police
19, Should you arrive at the ofice earlier than I do, please turn on the air-conditioner
20, If it snows , the children won't go to school
21, Had he not died so young , he would have been a famous musician by now
22, Unless you tell me the whole truth , I won't help you
23, Were I you , I would take good care of it
bài có 2 câu 13 nhé bạn !

viết lại câu sao cho nghĩa không đổi
1. I do not buy it because I do not have enough money
--> If I had enough money , i would buy it
2. I am búy now, so I can not help you
--> If I weren't buying now , i could help you
3. There will be a shortage of water unless it rains
--> If it doesn't rain , there will be a shortage of water
4. John is fat because she eat many chips
--> If she didn't eat many chips , she wouldn't be fat
5. I will only help you if you promise to try harder
--> Unless you promise to try harder , i won't help you
6. If it does not rain soon, the srops will be lost
--> Unless it rains soon , the crops will be lost
7. I am very tired so I can not concentrate properly
--> If i weren't tired , i could concentrate properly
8.We do not have a garden , so we do not grow our own vegetables
--> If we had a garden , we would grow our own vegetables
9. He does not give you good advice because he is not your true friend
--> If he were your true friend , he would giv you good advice
10. We come late becavuse the rain is so havely
--> If the rain weren;t so heavy , we wouldn't come late
viết lại câu sao cho nghĩa không đổi
1. I do not buy it because I do not have enough money
--> If I had enough money, I would buy it.
2. I am búy now, so I can not help you
--> If I wasn't busy now, I could help you.
3. There will be a shortage of water unless it rains
--> If it didn't rain, there would be a shortage of water.
4. John is fat because she eat many chips
--> If she didn't eat many chips, she wouldn't be fat.
5. I will only help you if you promise to try harder
--> Unless you promise to try harder, I will not help you.
6. If it does not rain soon, the srops will be lost
--> Unless it rains soon, the srops will be lost.
7. I am very tired so I can not concentrate properly
--> If I wasn't very tired, I could concentrate properly.
8.We do not have a garden , so we do not grow our own vegetables
--> If we had a garden, we would grow our own vegetables.
9. He does not give you good advice because he is not your true friend
--> If he was your true friend, he would give you good advice.
10. We come late becavuse the rain is so havely
--> If the rain wasn't so heavy, we wouldn't come late.

Ex1:Complete the second sentence so that it has similar meaning to the first sentence
1>The soil is poisoned because,farmers use too many pesticides and herbicides.
-If.............................famers used too many pesticides and herbicides, the soil would be poisoned ...............................................................................................
2>I can't help you unless you tell me what's wrong.
-If....................................you don't tell me what's wrong , I can't help you ......................................................................................
3>Many people have stomachache due to the contaminated food.
-The food..............................is contaminated so many people have stomacchache ....................................................................
4>Stop swimming in that lake,or you will have skin rashes.
-If...................................you don't stop swimming on that lake, you will have skin rashes........................................................................
5>John lives in the area affected by air pollution,so he has breathing problem.
-Because....................................John lives in the area affested by air pollution, he has breathing problem........................................................................
-If.................................John didn't live in the area affected by air pollution, he wouldn't have breathing problem........................................................................................
6>We use eco-friendly products and we can protect environment.
-It we...........................................use eco-friendly products, we can protect environment.......................................................................
7>I think you should volunteer to clean the beach.
-If I were....................................you, I would volunteer to clean the beach.............................................................
8>The air is polluied,so there are breathing problems(leads).
-> The air pollution leads to breathing problems
9>Their children have birth defects because the parents were exposed to radiotion(so)
-> The parents were exposed to radiotion so their children have birth defects

Viết lại câu:
1,''I advised you to take a holiday''The doctor continued =>"You'd better take a holiday" The doctor continued
2,If you don't rest yourself you really will be ill=>Unless you rest yourself ,you really will be ill
3,Speaking English fluetly is not easy=>It is not easy to speak English fluently
4,It's years since we decorated this room=>We haven't decorated this room for years
5,If join doesn't change his way,he will end up in prison=>Unless john changes his way,he will end up in prison
6,Unless someone has a key,we can't get into the house=>We can only get into the house if someone has a key
7,Peter is a careless driver.If he doesn't take more care,he'll have an accident=>Unless Peter takes more care,he'll have an accident
8,We couldn't anwer the question because it was very hard=>The quesstion was too hard for us to answer
9,The police made the boat turn back=>The boat was made to turn back by the police
11. Unless we protect the environment, we will destroy ourselves.
=> If .......we don't protect the environment, we will destroy ourselves..............................................
12. She will get low marks unless she is more hard-working.
=> If .......she isn't more hard-working, she will get low marks............................................................
13. Unless he listens to his parents, he will fail.
=> If .........he doesn't listen to his parents, he will fail...............................................
14. If we don't plant more trees, the air won't be fresher.
=> Unless ........we plant more trees, the air won't be fresher.............................................
15. We won't reduce pollution if we don't use fewer cars.
=> Unless ...we use fewer cars, we won't reduce pollution.................................................
16. If she doesn't cycle to school every day, she won't keep fit.
=> Unless ..........she cycles to school every day, she won't keep fit. .................................................
17. Use recycled products, and you will save money.
=> If ........you use recycled products, and you will save money............................................
18. Throw rubbish into the right bin, or you won't keep the environment clean.
=> If ........you don't throw rubbish into the right bin,you won't keep the environment clean. ....................................
19. Everybody will leave if he doesn't come to the party on time.
=> Unless .........he comes to the party on time, everybody will leave..................................................
20. Study hard, and you will get good grades.
=> If ...........you study hard, you will get good grades.................................................
21. Take an umbrella, or you will get wet.
=> If .....you don't take an umbrella, or you will get wet....................................................
22. Get up early in the morning, or you won't go to school on time.
=> If ..........you on't get up early in the morning, you won't go to school on time.......................................................