Viết lại câu với “if” sao cho nghĩa của câu không thay đổi.
1. I can’t finish this task you don’t give me a hand.
-> _____________________________________________________________________________
2. You will run out of money if you don’t stop wasting it.
-> _____________________________________________________________________________
3. Don’t call me unless it is an emergency.

-> _____________________________________________________________________________
4. James will not pass the test unless he studies harder.
-> _____________________________________________________________________________
5. If Jane finishes her work before 6 pm, she will dine out with her friends.
-> _____________________________________________________________________________
6. My brother won’t go travelling this summer if he doesn’t find a companion.
-> _____________________________________________________________________________
7. It is not easy to do these exercises unless you listen attentively to the teacher.
-> _____________________________________________________________________________
8. If Jim doesn’t submit his essay before Tuesday, he will be punished by the teacher.
-> _____________________________________________________________________________

II. Make conditional sentences, using if or unless. 1. Ican't finish this task if you don't give me a hand. 2. You will run out of money if you don't stop wasting it. 3. Don't call me unless it is an emergency. 4. James will not pass the test unless he studies harder. 5. If Jane finishes her work before 6 p.m, she will dine out with her friends. 1. Work hard and you will pass your exam. If 2. My brother is not good at playing tennis. My brother does not . 3. r'll be on vacation next week, so I won't be able to attend the meeting. Since 4. If you don't start working hard now, you won't be able to pass the final test. Unless . 5. Someone should take this garbage to the garbage dump soon. This garbage 1. I am a member of the anti-pollution program in my school. I often go to school by bus. (so) 2. The trees in this area were cleaned off. Public facilities would be constructed. (because of) 3. All the roads were flooded because it had been raining heavily. (due to) 4. Jimmy ate a lot of fast food, so he put on 10kilograms within just two months. (because) 5. My father got upset because I repeatedly left on the lights I was not using. (so)

Finish the second sentence in each pair, using If or Unless.

1.   If you don’t do better work than this, you won’t pass the exam.

2.   You can’t visit the United States unless you get a visa.

3.   Unless someone has a key, we can’t get into the house.

4.   Unless he phones immediately, he won’t get any information.

5.   If Joe doesn’t change his ways, he will end up in prison.

6.   If he doesn’t work harder, he’ll lose his job.

7.   If it rains, we won’t go swimming.

8.   You will become ill unless you stop working so hard.

9.   If you work hard, you’ll pass your exam.

10.  Unless you hurry, you won’t catch the bus.

11.  If he doesn’t start work right now, he’ll never finish it.

12.  We won’t get there on time without taking a taxi.

13.  Joan will stay on at school unless she finds a good job before September.

14.  If you don’t rest, you really will be ill.

15.  The child will die if nobody sends for a doctor.

16.  You won’t find any accommodation if you don’t book it in advance.

17.  You will catch a cold if you don’t keep your feet dry.

18.  I’ll call the police if you don’t leave me alone.

20. If he fails the final examination, he won’t be able to graduate.

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

22. If you don’t like this one, I’ll bring you another.

23. I’ll not able to do any work if I don’t have a quiet room.

24. If she doesn’t hurry, she’ll be late.

If he doesn’t take more care, he’ll have an accident.

-> Unless . ……………………………………………………………………………………………………….. .

The crops will be ruined if it doesn’t rain soon.

-> Unless ......... . ………………………………………………………………………………………………..

27.           Unless the weather is fine, we’ll stay at home.

->  If . . . . ………………………………………………………………………………………………………..

28.           I can’t go with you unless I get my work finished.

-> If ............... . ………………………………………………………………………………………………………..

29.           If you don’t leave on the 15^th , you’ll get home late for your mother’s party.

-> Unless............ . ………………………………………………………………………………………………..

30.           Tom never does anything unless his father tells him what to do.

-> If ............ . ………………………………………………………………………………………………………..

31.           Don’t take this job if you don’t really want it.

-> Unless ............ . ………………………………………………………………………………………………..

32.           If she does nothing to prepare for the test, she will get bad marks.

-> Unless ......... . ……………………………………………………………………………………………………..

33.           You can’t visit the United States unless you get a visa.

-> If ............... . ………………………………………………………………………………………………………..

34.           Unless you remember our address, you can find it in the phone book.

-> If ...................... . …………………………………………………………………………………………..

V : Rewrite the following sentences using “Unless” 1. I won’t go to school if I don’t feel better. …………………………………………… 2. Tony will talk to you if you question him. …………………………………………… 3. If you don’t put on your overcoat, you’ll be cold. …………………………………………… 4. You will fail the exam if you don’t work hard. …………………………………………… 5. You’ll get a cold if you don’t keep your feet dry. …………………………………………… 6. If I don’t leave now, I’ll miss my flight.

Rewrite the sentences, using conditional sentence type 1.

   1.     Don’t go out in the rain because you will get wet.

     ___________________________ .

   2.     I won’t enjoy the film if you aren’t with me.

     ___________________________ .

   3.     My brother will have enough money. He will buy a bicycle.

     ___________________________ .

   4.     I will buy a new hat. I will give it to you.

     ___________________________ .

   5.     Let’s ask the teacher. He will explain it to you.

     ___________________________ .

EXERCISE 1: Rewrite the following sentences using “Unless”

1. I won’t go to school if I don’t feel better.

2. Tony will walk to you is you question him.

3. If you don’t put on your overcoat, you’ll be cold.

4. You will fail the exam if you don’t work hard.

5. You’ll get a cold if you don’t keep your feet dry.

6. If I don’t leave now, I’ll miss my flight.

7. If you aren’t going to the party, I won’t go.

8. I can’t send you a postcard if  you don’t give me your address.

9. If I won a big prize in a lottery, I’d build a school for the poor.

10. I’ll call the police if you don’t leave me alone.

EXERCISE 2: Rewrite the following sentences using conditional sentences type 2.

1. They are poor, so they can’t help us.

2. He doesn’t do this homework. He is always punished.

3. He doesn’t have enough time. He can’t help me.

4. She doesn’t take any exercise, so she is overweight.

5. He doesn’t have a bicycle, so he always goes to class late.

6. I am bad at English, so I can’t do homework.

7. He doesn’t practise speaking French, so he doesn’t speak it fluently.

8. The meeting can be cancelled because it snows heavily.

9. We don’t go because it will rain.

10. John is fat because he eats so many chips.

EXERCISE 3: Rewrite the following sentences using conditional sentences type 3

1. He didn’t hurry, so he missed the train.

2. We didn’t go because it rained.

3. We got lost because we didn’t have a map.

4. He lost his job because he was late everyday.

5. The dress was so expensive. She could not buy it.

6. Sue felt sick because she ate four cream cakes.

7. My brother left the car keys, so I had to pick him up at the station,

8. We didn’t go on holiday because we didn’t have enough money.

9. He didn’t have the ticket to the game last week. He wasn’t be able to get in.

10. Robert got a bad cough because he started smoking cigarettes.

Finish each of the following sentences in such a way that it is as similar as possible in meaning to the original sentence.

1. I didn’t know that you were in the hospital, so I didn’t visit you.

→ If ____________________________________________.

2. Hurry up or you will be late.

→ If ____________________________________________.

3. She is very busy, so she can’t help me now.

→ If ____________________________________________.

4. He didn’t phone me because he didn’t know my phone number.

→ If ____________________________________________.

5. You’re unfit because you don’t take exercise.

→ If ____________________________________________.

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

→ If ____________________________________________.

7. If I have time, I’ll help you.

→ Unless ____________________________________________.

8. He didn’t study his lessons very carefully, so he gets bad marks now.

→ If ____________________________________________.

9. Dick often causes accidents because he drives carelessly.

→ If ____________________________________________.

10. I can’t apply for that job because I don’t know English.

→ If ____________________________________________.