Complete the following sentences using if or unless.

1. I will take the job …………………. the salary is too low.

a) if b) unless

2. ……………………. you smoke like this, you will be seriously ill.

a) if b) unless

3. I will be back tomorrow ………………………. there is a plane strike.

a) if b) unless

4. Let’s go for a walk – ……………………….. you are too tired.

a) if b) unless

5. I will be surprised ……………………… he doesn’t have an accident soon.

a) if b) unless

6. Jane will be very upset ………………………. I don’t get back tomorrow.

a) if b) unless

7. You will look prettier ……………………….. you don’t wear too much make-up.

a) if b) unless

8. …………………….. you give me the keys of the safe, I will shoot you.

a) if a) unless

9. I won’t be able to solve this problem …………………….. you help me.

a) if b) unless

10. ……………………. you don’t stop making that stupid noise, I will hit you.

a) if b) unless

Answers

1. I will take the job unless the salary is too low.

2. If you smoke like this, you will be seriously ill.

3. I will be back tomorrow, unless there is a plane strike.

4. Let’s go for a walk – unless you are too tired.

5. I will be surprised if he doesn’t have an accident soon.

6. Jane will be very upset if I don’t get back tomorrow.

7. You will look prettier if you don’t wear too much make-up.

8. Unless you give me the keys of the safe, I will shoot you.

9. I won’t be able to solve this problem unless you help me.

10. If you don’t stop making that stupid noise, I will hit you.