1. Our vacation lasts three months.                  

 It’s a …………………………………………………………………….………………

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

Unless …………………………………………………………………………………

3. Your shirt is very nice.                                          

What………………………………………………………………………………….!

4. The hot weather prevented us from going swimming.

We couldn’t ………………………………………………………………………..

5. Every day, my father spends half an hour going jogging.

It takes …………………………………………………………………………………..

6. She needn’t do it so quickly.

She doesn’t have ………………………………………………………………….

7. We didn’t enjoy the trip because of the heavy rain.

The heavy rain prevented …………………………………………………

8. You shouldn’t eat too much candy.

 You’d ……………………………………………………………………..

9. This exercise is easier than that one.

That exercise is not ………………….........................................................…………………………..

10. The weather is too sunny for us to go out.

The weather isn’t…………………..............................................................…………………………..

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 ...................... . …………………………………………………………………………………………..

2. If – clause:

1. Study hard or you will fail the exam.

→ If you …………………………………………………………

→ If you …………………………………………………………………………………………………

2. Work hard or you won’t pass your examination.

→ If you ………………………………………………………………………………………………….

→ If you ………………………………………………………………………………………………….

3. Water flowers or they will die.

→ If you ………………………………………………………………………………………………….

→ If you ………………………………………………………………………………………………….

4. Keep the environment clean or we won’t have an ideal place to live.

→ If we ………………………………………………………………………………………………….

→ If we ………………………………………………………………………………………………….

5. Get up early or you’ll be late for school.

→ If you ………………………………………………………………………………………………….

→ If you ………………………………………………………………………………………………….

28. Work hard and you will pass your exam If……………………………………………………………………………………                                  29. I’ll be on vacation next week, so I won’t be able to attend the meeting.                                  Since ………………………………………………………………………………..

V.Write the first conditional sentences.

1.   You should work hard, or you won’t pass the exam.

      If

2.   Henry fails his examination. His parents will be sad.

      If ______________________________________________________

3.   If you don’t come , he will go

      Unless __________________________________________________

4.   I think it’ll snow tomorrow. I will go skiing.

      If ______________________________________________________

5.   He should leave soon, or he’ll miss the bus.

      If ______________________________________________________

6.   Don’t play with matches. You will hurt yourself.

     If            

1. Write the second sentences so that it has a similar meaning to the first
28. Work hard and you will pass your exam 
If……………………………………………………………………………………
29. I’ll be on vacation next week, so I won’t be able to attend the meeting
Since ………………………………………………………………………………..
30. If you don’t start working hard now, you won’t be able to pass the final test
Unless………………………………………………………………………………..
31. Someone should take this garbage dump soon
This garbage…………………………………………………………………………

II. Complete the second sentence so that it has similar meaning to the first. 

1. We should work hard, or we won’t pass the exam.                            

-> If we work ……………………………………………………………………………

2. Don’t play with matches. You will hurt yourself.

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

3. Learning about recycling is interesting.

-> It’s fun …………………………………………………………………………………

4. Let’s write about the three Rs?

-> Why don’t ……………………………………………………………………………..

5. Don’t provoke the monkey, it will attack you.

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

6. Use reusable bags for shopping and we will help the environment.

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

7. Why don’t we plant more trees and flowers?

-> How about ……………………………………………………………………………?

8. The school is so beautiful and clean!

-> What a ………………………………………………………………………………..!

25.Hurry up or we’ll be late for the concert. =>If we don’t.......................................................................................................... 26.Study hard or you won’t pass the exam. =>If you............................................................................................................. 27.If it doesn’t rain, we will go camping. =>Unless it................................................................................................................ 28.Unless we protect the environment, our life will be badly affected. =>If................................................................................. 29.If someone doesn’t put the coal in, the fire will go out . => Unless........................................................................................... 30.Keep quiet or I’ll scream. =>Unless you............................................................................................................................. 31. Come here or else she will punish you. =>If you...................................................................................................................... 32.We spent 5 hours getting to London. => It took......................................... ................................ ................................................... 33.Ha Noi has got a lot of old buidings. =>There......................................... .......................................... 34.Let’s play chess. => I suggest........................................... .................. ........................................................... 35.How much do the black shoes cost? =>How................................. ..............................................................? 36.Nam plays tennis very well. => Nam is a ..................................... ....................................................... 37.Last year we took a plane to Ho Chi Ming city. => Last year we went .......................................... 39.Whose handbag is this? =>Who does................................... ................................. .........................................? 40.Unless we protect the environment, our life will be badly affected. => If ...........................................................