1/ We won't go out unless it stops raining 
--> We won't go out if it doesn't stop raining 
2/ I will call the police unless you give back my bicycle 
--> I will call the police if you don't give back my bicycle 
3/ You wouldn't be able to do this exercise unless your English were good 
--> You wouldn't be able to do this exercise if your English were not good 
4/ Unless we had enough rain, we couldn't grow rice 
--> If we didn't have enough rain, we couldn't grow rice 
5/ The fishermen couldn't have caught a lot of fish unless they had had good nets 
--> The fishermen couldn't have caught a lot of fish if they hadn't had good nets 
6/ I wouln't buy it unless I could afford it 
--> I wouln't buy it if I couldn't afford it 
7/ I would refuse to go unless they paid my expenses 
--> I would refuse to go if they didn't pay my expenses 
8/ I don't agree with his economic policy. I wouldn't vote for him unless he changed it 
--> I don't agree with his economic policy. I wouldn't vote for him if he didn't change it 
9/ He wouldn't have written unless he had heard news 
--> He wouldn't have written if he hadn't heard news 
10/ You might not have a terrible toothache unless you went to the dentist regularly 
Câu này phải bỏ "not" thì mới đúng nghĩa. 
You might have a terrible toothache unless you went to the dentist regularly 
--> You might have a terrible toothache if you didn't go to the dentist regularly 

Chúc you hok tốt nhé 

1/ We won't go out unless it stops raining 
--> We won't go out if it doesn't stop raining 
2/ I will call the police unless you give back my bicycle 
--> I will call the police if you don't give back my bicycle 
3/ You wouldn't be able to do this exercise unless your English were good 
--> You wouldn't be able to do this exercise if your English were not good 
4/ Unless we had enough rain, we couldn't grow rice 
--> If we didn't have enough rain, we couldn't grow rice 
5/ The fishermen couldn't have caught a lot of fish unless they had had good nets 
--> The fishermen couldn't have caught a lot of fish if they hadn't had good nets 
6/ I wouln't buy it unless I could afford it 
--> I wouln't buy it if I couldn't afford it 
7/ I would refuse to go unless they paid my expenses 
--> I would refuse to go if they didn't pay my expenses 
8/ I don't agree with his economic policy. I wouldn't vote for him unless he changed it 
--> I don't agree with his economic policy. I wouldn't vote for him if he didn't change it 
9/ He wouldn't have written unless he had heard news 
--> He wouldn't have written if he hadn't heard news 
10/ You might not have a terrible toothache unless you went to the dentist regularly 
--> You might not have a terrible toothache if you go to the dentist regularly 

II. Đặt câu điều kiện, sử dụng if hoặc if. 1. Tôi không thể hoàn thành nhiệm vụ này nếu bạn không giúp tôi một tay. 2. Bạn sẽ hết tiền nếu bạn không ngừng lãng phí nó. 3. Đừng gọi cho tôi trừ khi đó là trường hợp khẩn cấp. 4. James sẽ không vượt qua bài kiểm tra trừ khi anh ấy học chăm chỉ hơn. 5. Nếu Jane hoàn thành công việc của mình trước 6 giờ tối, cô ấy sẽ đi ăn tối với bạn bè của mình. 1. Làm việc chăm chỉ và bạn sẽ vượt qua kỳ thi của mình. Nếu 2. Anh trai tôi chơi tennis không giỏi. Anh trai tôi thì không. 3. Tôi sẽ đi nghỉ vào tuần tới, vì vậy tôi sẽ không thể tham dự cuộc họp. Kể từ 4. Nếu bạn không bắt đầu làm việc chăm chỉ ngay bây giờ, bạn sẽ không thể vượt qua bài kiểm tra cuối cùng. Trừ phi . 5. Nên sớm có người đem rác này đến bãi rác. Thùng rác này 1. Tôi là thành viên của chương trình chống ô nhiễm ở trường tôi. Tôi thường đi học bằng xe buýt. (như vậy) 2. Cây cối trong khu vực này đã được làm sạch. Các cơ sở công cộng sẽ được xây dựng. (bởi vì) 3. Tất cả các con đường đều bị ngập vì trời mưa rất to. (do) ​​4. Jimmy đã ăn rất nhiều thức ăn nhanh, vì vậy anh ấy đã tăng 10kilogram chỉ trong vòng hai tháng. (bởi vì) 5. Cha tôi đã bực tức vì tôi đã liên tục bật đèn mà tôi không sử dụng. (Vì thế)

câu thì làm r câu thì chưa :v Mình nhìn trên đó hình như thiếu 1cái đề bài

Rewrite:

1. I'll help you if you promise to try harder

-Unless.......you promise to try harder, I will not help you ......

2. When you press this button, this machine will start

- If.........you don't press this button, this machine will not start ......

3. Today is an awful day, so we can't go to the beach

- If.......today weren't an awaful day, we could go to the beach ........

4. It is raining, so we can't go out

- Unless.........it is raining, we can go out ........

5. If you don't rest yourself, you really will be ill

- Unless.........you don't rest yourself, you really will be ill .......

6. Unless he phones immediately, he won't get any information

- If.........he doesn't phone immediately, he won't get any information ......

7. We got lost because we didn't have a map

- If.......we had had a map, we wouldn't have got lost ....

8. You'd better learn English

- If I were.......you, I would learn English .......

9. If you don't start at once, you will be late

- Unless........you start at once, you will be late .......

10. Unless you water the tree every day, it will die

- If.....you don't water the tree everyday, it will die .....

Rewrite:

1. I'll help you if you promise to try harder

-Unless...............you don't promise to try harder,I'll help you.........

2. When you press this button, this machine will start

- If..........you press this button, this machine will start.................

3. Today is an awful day, so we can't go to the beach

- If........ Today weren't an awful day, so we could go to the beach.....

4. It is raining, so we can't go out

- Unless...........it were raining, we could go out.............................

5. If you don't rest yourself, you really will be ill

- Unless...........you rest yourself, you really will be ill..........

6. Unless he phones immediately, he won't get any information

- If......he doesn't phone immediately, he won't get any information...

7. We got lost because we didn't have a map

- If..........we had had a map,We wouldn't have got lost.........................

8. You'd better learn English

- If I were.............you,I would learn English....................

9. If you don't start at once, you will be late

- Unless................you start at once, you will be late.................

10. Unless you water the tree every day, it will die

- If................you don't water the tree every day, it will die.........

Chia động từ:

1. If he (study) hard, he'll pass the final exam. STUDIES

2. If today were Christmas day, the children (receive) toys from Santa Claus. WOULD RECEIVE

3. If it (be) fine tomorrow, we'll plant some flowers in the garden. IS

4. If I (have) enough money, I'll take a trip to Ha Noi. HAVE

5. If the children finish their homework early, they (watch) the games on TV. WILL WATCH

6. If the road were repaired, there (not be) such a bad accident. WOULDN'T BE

7. It's raining now. You (get) wet if you don't wear you raincoat. WILL GET

8. She's a little bit lazy. If she (work) harder, she will get better grades. WORKS

9. He is an active student. If he (be) here today, he would have some activities for the meeting. HAD BEEN

10. If it (not rain) tomorrow, we'll go to the park. DOESN'T RAIN

11. If she (need) a computer, she can borrow mine. NEEDS

12. Can I have a day of tomorrow if I (work) hard today? WORK

13. If you (speak) more slowly, he might understand you. SPOKE

14. The trip can be postponed if the weather (be not) fine. ISN'T

15. If she (want) to get there before dark, she should start at once. WANTED

Choose the best answer for each of the fllowing sentences
1. ............ if you work harder, you will be sacked.
A. Whether B. If C. However D. Unless

2. 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

3. If you take the ice out of the fridge, it ...........
A. vaporizes B. melts C. heats D. disappears

4. 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

5. 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

6. Unless we .......... more snow, we can't go skiing.
A. will have B. have C. have had D. had

7. You'll fail the exam ........... you start revising.
A. if B. until C. when D. unless

8. Unless you wash the car, you .............. not drive it at the weekend
A. would B. could C. have to D. may

9. If Peter ............... his car before the drive, he ................ the problem of out of petrol.
A. cheked / will not get B. had checked / would not have got
C. checks / will not have got D. would be checking / will not have got

10. 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 step on the mine, it wouldn't have exploded.

1.Peter is fat because he eats so many chips => 

If he didn't eat so many chips, he wouldn't be fat

2.If you are not careful,you will cut yourself with that knife =>

Unless you are careful,you will cut yourself with that knife.

3.If you do not like this one,I'll bring you another =>

Unless you like this one, I'll bring you another.

4.I'll not be able to do any work if I do not have a quiet room =>

.Unless I have a quite room,I'll not be able to do any work.

5.If she does not hurry,she will be late =>

Unless she hurries, she’ll be late.

6.She doesn't have a bike so she has to walk to school =>

If she had a bicycle, she wouldn't have to walk to school

7.I am not rich businessman and I can't afford to buy an expensive car =>

 If I were a rich businessman, I could afford to buy an expensive car

 8.My parents don't allow me to go,so I have to stay at home =>

 If my parents allowed me to go, I wouldn't have to stay at home

9.She doesn't pay attention to her cooking so the food is horrile =>

If she paid attention to her cooking, the food wouldn't be horrible

10.They do not know each other very well so they do not talk to each other =>

 If they knew each other very well , they would not be reserved 

11.He is not a millionaire,so he can't give you all that you want => 

 If he were a millionaire , he could give you all that you want 

12.She loves him so she forgives him easily =>

 If she didn't love him, she wouldn't forgive him easily.

13.We get up late in the morning so we do not have time to have breakfast =>

If we got up late this morning, he wouldn't have time to have breakfast

14.If she does not hurry,she will be late for school => 

.Unless she hurries,you'll be late.

15.We can't go out because he has to study for his exam => 

 If he didn't have to study for his exam, he could go out

16.She is lazy so she can't pass the exam =>

 If she weren't lazy, she could pass the exam.

17.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

18.He smokes too much;that why he can't get rid of his cough =>

 If he didn’t smoke too much, he could get rid of his cough.

19.She is very shy,so she doesn't enjoy the party =>

 If she weren’t very shy, she would enjoy the party.

20.He doesn't take any exercises.He is so unhealthy =>

 If he took some exercises, He would be healthy.

21.Study hard or you won't pass the exam =>

If you don’t study hard, you won’t pass the exam.

22.Don't be impatient or you will make mistakes =>

 If you are impatient, you will make mistakes.

23.If you want my advice,I wouldn't buy it => 

 If I were you, I wouldn't buy it.

24.I only come if they invite me =>

 Unless they invite me, I will not come.

25.He didn't revise all his lessons,he failed the exam =>

 If he had revised all his lessons, he wouldn't have failed the exam.

26.Leave me alone or I'll call the police =>

Unless you leave me alone, I'll call the police

1. Peter is fat because he eats so many chips

If he didn't eat so many chips, he wouldn't be fat

2.If you are not careful,you will cut yourself with that knife 

Unless you are careful,you will cut yourself with that knife.

3.If you do not like this one,I'll bring you another 

Unless you like this one, I'll bring you another.

4.I'll not be able to do any work if I do not have a quiet room 

Unless I have a quite room,I'll not be able to do any work.

5.If she does not hurry,she will be late

Unless she hurries, she’ll be late.

6.She doesn't have a bike so she has to walk to school 

If she had a bicycle, she wouldn't have to walk to school

7.I am not rich businessman and I can't afford to buy an expensive car 

 If I were a rich businessman, I could afford to buy an expensive car

 8.My parents don't allow me to go,so I have to stay at home 

 If my parents allowed me to go, I wouldn't have to stay at home

9.She doesn't pay attention to her cooking so the food is horrile 

If she paid attention to her cooking, the food wouldn't be horrible

10.They do not know each other very well so they do not talk to each other 

 If they knew each other very well , they would not be reserved 

11.He is not a millionaire,so he can't give you all that you want 

 If he were a millionaire , he could give you all that you want 

12.She loves him so she forgives him easily 

 If she didn't love him, she wouldn't forgive him easily.

13.We get up late in the morning so we do not have time to have breakfast 

If we got up late this morning, he wouldn't have time to have breakfast

14.If she does not hurry,she will be late for school 

Unless she hurries,you'll be late.

15.We can't go out because he has to study for his exam 

 If he didn't have to study for his exam, he could go out

a. Put the verb in brackets into the correct tense:

1.If I see him, I (give) ...........will give............................ him a gift.

2.If he (study) ...............studies..................... hard, he can pass the exam.

3.Rice plants (grow) ..........will grow...................... if there is enough rain.

4.If she (not hurry) .........does not hurry........................, she may be late.

5.If I tell you a secret, ..will............. you (promise) ......promise.................. not to tell it to anyone ?