A. Complete the exercise with If or Unless.

1. -------- you drive more carefully, you will have an accident.

2. ---------- you prune these trees, they won’t grow well.

3. He’ll get lost ---------------someone shows him the way.

4. ---------------- you practice your English, you can improve it quickly.

5. ------------------ you don’t hurry, you’ll be late for school again.

6. ---------------- there is oxygen, fire cannot burn.

7. --------------------you go to bed late, you’ll feel tired in the morning.

8. My parents will be angry ---------------------- I pass my exams.

9. You can’t travel abroad -----------------you don’t have a passport.

10. You can’t watch TV ----------------you finish your homework.

11.-------------------they lower the price, I won’t buy that computer.

B. Complete the exercise with If or When.

1. -------------------I am late this evening, don’t wait for me.

2. ---------- I don’t see you tomorrow, I will phone you.

3. Do you mind --------------I close the window?

4. ---------------------- I get up in the morning I usually drink a cup of coffee.

5. Have something to eat. ---------------you don’t eat now, you’ll be hungry later.

6. John is still at school. ------------------- he leaves, he wants to go to university.

7. Be careful! ----------------you aren’t careful, you’ll fail.

8. -------------I see him, I will tell you right away.

9. Please call us ---------------- you arrive.

10. I am going to tell her --------------- she comes.
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