Choose the sentence that has the same meaning as the first.

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

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

B. If you are careful, you will cut yourself with that knife.

C. Unless you are not careful, you will cut yourself with that knife.

D. Unless you were careful, you will cut yourself with that knife.

25. Because he doesn’t leave immediately, I call a policeman.

A. Unless he leaves immediately, I won’t call a policeman.

B. If he leaves immediately, I won’t call a policeman.

C. Unless he leaves immediately, I will call a policeman.

D. If he left immediately, I wouldn’t call a policeman.

26. Today isn’t Sunday, so the pupils can’t go swimming.

A. If today is Sunday, the pupils could go swimming.

B. If today were Sunday, the pupils could go swimming.

C. The pupils could go swimming unless today is Sunday.

D. The pupils could not go swimming if today isn’t Sunday.

27. Stop talking or you won’t understand the lesson.

A. If you don’t stop talking, you won’t understand the lesson.

B. If you don’t stop talking, you wouldn’t understand the lesson.

C. If you hadn’t stopped talking, you wouldn’t understand the lesson.

D. If you hadn’t stopped talking, you wouldn’t have understood the lesson.

28. If the homework is difficult, I will ask you for help.

A. Unless the homework is easy, I won’t ask you for help.

B. Unless the homework is difficult, I will ask you for help.

C. Unless the homework is easy, I will ask you for help.

D. Unless the homework isn’t difficult, I won’t ask you for help.

29. I’ll let you borrow the book but you must promise to return it next week.

A. If you promise to return the book, I let you borrow it.

B. If you promised to return the book, I’ll let you borrow it.

C. If you promise to return the book next week, I’ll let you borrow it.

D. If you promise to return the book next week, I won’t let you borrow it.

III. Use UNLESS instead of IF :

1.      Unless she hurries, she’ll be late.

2.      Unless you like this one, I will bring you another. ………………………………………………

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

4.      I’ll be able to do any work unless I don't now have a quiet room.

IV. Combine each pairs of these sentences, using IF :

Type 1 :

1.     If we recycle, we’ll save natural resources. ………………………………………………………..

2.    If you aren't careful careful or you will fall over the rocks. ………………………………………………………..

3.      If you work too much, you will feel tired. ………………………………………………………

4.      If you are careless, you’ll break the vase. ……………………………………………………….

5.      Ha can pass the exam if she works hard.………………………………………………………

6.      He can do a part to save the environment if he buys recycled products.

7.      if we put garbage into the bins, we will minimize pollution.

8.      If We don't take the map with us, we will lose our way on the street.

9.      Ellen can borrow it if she gives it back next week.

10.If The authorities are thinking of raising the petrol prices,I will have to cycle to work.

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

II. Use UNLESS instead of IF.

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

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

2. If you do not like this one, I’ll bring you another.

-> Unless you like this one, I’ll bring you another. 

3. I’ll not be able to do any work if I do not have a quiet room.

-> Unless I have a quiet room, I’ll not be able to do any work.

4. If she does not hurry, she’ll be late.

-> Unless she hurries, she’ll be late. 

5. If we had more rain, our crops would be better.

-> Unless we had more rain, our crops wouldn't be better. 

6. The crops would have been ruined if the flood had risen higher.

-> Unless the flood had risen higher, the crops wouldn't have been ruined.

7. If you had not sneezed, he wouldn’t have known that we were there.

-> Unless had sneezed, he wouldn’t have known that we were there. 

8. If she did her hair differently, she would look quite nice.

-> Unless she did her hair differently, she wouldn't look quite nice.

9. If John had played for our football team, we would not have lost the game. 

-> Unless John had played for our football team, we would have lost the game. 

10. If I won a big prize in a lottery, I’d give up my job.

-> Unless I won a big prize in a lottery, I wouldn't give up my job.

1 Unless you are careful, you will cut your self with that knife

2 Unless you like this one,  I’ll bring you another

3  I’ll not be able to do any work unless I have a quiet room

4 Unless she hurries, she’ll be late

5 Unless we had more rain, our crops wouldn't be better

6 The crops wouldn't have been ruined unless the flood had risen higher

7  Unless you had not sneezed, he wouldn’t have known that we were there

8 Unless she did her hair differently, she wouldn't look quite nice

9  Unless John had played for our football team, we would have lost the game.

10 Unless I won a big prize in a lottery, I’d not give up my job.

Use UNLESS INSTEAD of IF:

1. if you are not careful, you will cut yourself with that knife.

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

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

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

3. She'll be late if she does not hurry.

-Unless she hurries, she will be late.

4. If you don't sneeze, he won't know that we are there.

-]Unless you sneeze, he won't know that we are there.

5. Turn down the gas or the rice will burn.

-Unless you turn down the gas, the rice will burn.

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

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

2. If you do not like this one, I’ll bring you another.   

-> Unless you like this one, I’ll bring you another.   

3. I’ll not be able to do any work if I do not have a quiet room.         

-> I’ll not be able to do any work unless I have a quiet room.

I. Use UNLESS instead of IF:

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

- Unless...........you're careful,you will cut yourself with that knife........

2. If you do not like this one, i'll bring you another

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

3. She'll be late if she does not hurry.

- Unless.........she hurries,she'll be late.........

4. If you doesn't sneeze, he won't know that we are there.

- Unless........you sneeze, he won't know that we are there..........

5. If she does her hair diffrently, she will look quite nice.

- Unless........she does her hair differently she will look quite nice........

II. Make conditional sentences according to the fact provided (type1)

1. Keep silent or you wake the baby

- ............................if you don't keep silent, you will wake the baby up..................................

2. Go right now or you'll be late for the train.

-...............................unless you go right now, you'll be late for the train........................

3. Practice speaking English regularly or you will not pass this entrance exam.

-...........................unless you practice speaking english regularly, you won't pass this entrance exam ........................

1. If you (be not) ____are not__________ careful , you’ll cut yourself with that knife.
2. If you (want)________want______ to attend medical school , you must study hard.
3. If you (not stop )________don't stop______daydreaming, you won’t understand the lesson.
4. If you learn the lessons carelessly , you (get ) ______won't get_______ poor marks.
5. If you don’t do exercise regularly , you (not get fit ) ______will not get fit____________.

a) unless you are careful, you will cut yourself with that knife

b) unless you this one, I'll bring you another

c) Unless she hurries, she will be late

d) I'll not be able to do any work unless I have a quiet room.

e) Unless she waters these trees, they will die.

f) He will stay here unless he wants to go.