I didn't send you a present because I didn't have your address --> If
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1. If my parents allowed me to go, I wouldn't have to stay at home.
2. If the computer hadn't broken down, I wouldn't have had to stop my work.
3. If she didn't love him, she wouldn't forgive he easily.
4. If you had often talked to them, they would have understood you.
5. If I had had a dictionary, I could have looked the word up.
6. If Sandra had got her camera, she could take a photo.
7. If I didn't have to work tomorrow evening, I would meet you.
8. If it hadn't been raining, we could have had lunch in the garden.
9. If Susan had got a watch, she wouldn't be often late for work.
10. If he didn't smoke forty cigarettes a day, he wouldn't cough a lot.
11. If I had a boat, I would sail around the world.
12. If they had had a garden, they would have grown vegetables.
13. If I had known his address, I would have given it to you.
14. If the doctor hadn't been so late, he could have seen many patients.

1.My sister didn't go to school yesterday because she was sick
2.Wash you hand more or you get flu
3.I have worked for Go Green for five months
4.He got up late so he missed the first bus ( làm thế thôi chứ còn nhiều cách khác )
My sisiter didn't go to school yesterday because she of her sickness
_ My sister didn't go to school yesterday because she was sick
You'll get flu if you don't wash your hand more
-> Wash your hand more or you'll get flu
I began working for Go Green five moths ago
-> I have worked for Go Green for five months
He missed the first bus because he got up late
-> If he hadn't got up late, he wouldn't have missed the first bus.

6 I hadn't been very busy, I would have phoned you.
7 I had had an umbrella, I wouldn't have got wet in the rain.
8 Peter hadn't been very nervous, he wouldn't have failed the driving test.
9 I had had some money on me, I would have taken a taxi.
10 she had had a visa, she could have come to that country.

1. If I had enough money, I would buy that latop.
2. If I had enough money, I could buy that expensive dictionary.
3. Unless we mustn't do our homework well, our teacher will get angry with us.
4. Unless you keep your feet dry, you will catch a cold.
5. If she knew you were in hospital, she would visit you.
6. If you don't water the plants everyday, they will die.
7. Had the police found out him. he would have been introduce.
8. If it hadn't been our father's encouragments, we couldn't have got the prize.
9. If Nam hadn't helped me, I wouldn't have been able to solve this difficulty.
10. If John didn't eat so many chips, he wouldn't be fat.
11. Had Laura not supported me, I wouldn't have been able to finish the project.
12. If you weren't lucky, you might not get your novel published.
13. If I advice Mary, my advice is that she should apply for that job.
14. Without air, we can't survice.
15. Had it not been your warming, I could't prevent my failture in the test.
16. Unless it is sunny, they won't go swimming.
17. Without efforts from everyone of us, we could have lost that match.
Bạn@Phạm Thúy Hường có vẻ là bạn nhầm câu 3,8 một chút rồi bạn ạ!
3:Unless we must do our homework well ,our teacher will be very angry.
(thế này nha bạn : nếu chúng tôi không làm bài về nhà tốt thì cô giáo sẽ giận.
vì unless=if not rồi bạn ạ ,bạn không cần thiết phải cho thêm not vào vế đầu , như vây là sai rồi đó!)
8:Câu này bạn thiếu for sau hadn't been rồi nha!
Còn các câu sau thì ổn cả rồi bạn ạ!
Mình chỉ nhận xét vậy thôi nha!

1. He lost his money simply because he wasn't careful. (If)
=> If he hadn't been careless , he woundn't have lost his money
2. He didn't hurry, so he missed the train. (If)
=> If he had hurried, he could have caught the train.
3. We didn't go because it rained. (If it hadn't)
=> If it hadn't rained we would have gone
4. Without this treatment, the patient would have died. (If he)
=> If it hadn’t been for this treatment, the patient would have died.
5. Mr.Mills lost his job because he was late every day. ( If Mr.Mills)
=> If Mr Mills hadn't been late everyday ,he wouldn't have lost his job
6. We didn't go on holiday because we didn't have enough money. (If we)
=> . If we had had enough money we would have gone on holiday.
1. He lost his money simply because he wasn't careful. (If)
=>if he had been cafeful, he would not have lost his money
2. He didn't hurry, so he missed the train. (If)
=>If he had hurried, he would have missed.
3. We didn't go because it raines. (If it hadn't)
=>If it hadn't rained, we would have gone.
4. Without this treatment, the patient would have died. (If he)
=>If he hadn't been for this treatment, the patient would have died
5. Mr.Mills lost his job because he was late every day. ( If Mr.Mills)
=>If Mr.Mills losts his job ,he lates every day
6. We didn't go on holiday because we didn't have enough money. (If we)
=> If we had had enough money, we would have gone holiday
7. I was sick yesterday, so I didn't go to class (If)
=>If I am sick, I don't go to school
8. Because Alan never eats breakfast, he always overeats at lunch (If)
=>If Alan never eats breakfast, he always overeats at lunch
9.Fred wouldn't do that if he didn't have your permission (Unless)
=>Unless Fred had your permission, he wouldn't for that
10. If no more guests come, there will be enough food for everyone. (Unless)
=>Unless no more guests come, there will not be enough food for everyone

Ex: Rewriting
1 I'm busy so i can't go out with my friends
➞ If I wasn't busy, I could go out with my friends
2 He plays soccer well so he can take part in the Games
➞ If He didn't play soccer well, he couldn't take part in the Games
3 She can't go to the party because i don't invite her
➞ If i invited her ,She could go to the party
4 I can't get a job easily because I don't have a degree
➞ If I had a degree ,I could get a job easily
5 He doesn't have enough money , so he doesn't buy a house
➞ If He had enough money , he would buy a house
6 It is raining heavily so we can't go to the market
➞ If It wasn't raining heavily ,we could go to the market
7 He will go to watch the World Cup because he is studying in Russi
➞ If he wasn't studying in Russi ,He wouldn't go to watch the World Cup
8 I didn't talk to him because i didn't know him
➞ If i had known him ,I would have talked to him
9 John didn't have money so he couldn't lend you some
➞ If John had had money , he could have lent you some
10 We couldn't go out because the weather was so bad
➞If the weather hadn't been so bad, We could have gone out
11 Mary didn't wear the raincoat, so she got a cold
➞If Mary had worn the raincoat, she wouldn't have got a cold
12 Marry was injured in the crash because she wasnot wearing the seat belt
➞ If Marry had been wearing the seat belt ,she wouldn't have been injured in the crash
13 Carol didn't answer the phone because he was studying
➞ If Carol hadn't been studying,he would have answered the phone
14 You didn't eat breakfast, so you are hungry now
➞If You had eaten breakfast, you wouldn't be hungry now
15 I stayed up late last night, so i feel asleep now
➞If I hadn't stayed up late last night, i wouldn't feel asleep now
16 I can't retell the film now because i didn't wlatch it last night
➞If i had watched it last night ,I could retell the film now
17 He is tired now because he drank too much yesterday evening
➞If he hadn't drunk too much yesterday evening, He wouldn't be tired now
18 I bought the car yesterday, so I run out of money now
➝ If I hadn't bought the car yesterday, I wouldn't run out of money now
19 He didn't go to the class regularly, so he can't take part in the competition now
➞If He had gone to the class regularly, he could take part in the competition now
I didn't send you a present because I didn't have your address
☛ If I had yours address, I would send you a present
If I had had your address, I would have sent you a present