Fill in the gaps with if or unless.
1 I'll only call you if there is a problem.
2 you want a new computer, you had better save some money.
3 you don't leave at once, you'll be late.
4 I'll have that last piece of cheese you don't want it.
5 I'll come with you to the doctor you
want to go alone.
6 I will join you later I have too much work to do.
7 I can lend you my umbrella you need it.
8 I won't talk to you again you tell me the truth.​

Слово if переводится как «если», а слово unless - как «если не/если только не»

2 If you want a new computer, you had better save some money.

3 If you don't leave at once, you'll be late.

4 I'll have that last piece of cheese if you don't want it.

5 I'll come with you to the doctor unless you  want to go alone.

6 I will join you later unless I have too much work to do.

7 I can lend you my umbrella if you need it.

8 I won't talk to you again unless you tell me the truth.​