2. The room is dirty because it is not cleaned often.
→ If the rooms cleaned often, it
3. We don’t visit our parents often because they live far away.
→ If ____________________
4. She is very shy; that’s why she doesn’t enjoy parties.
→ If ____________________
5. You work so fast; that’s why you make so many mistakes.
→ If _____________________
6. He doesn’t work overtime, so he doesn’t earn as much as I do.
→ If _______________________
7. We don’t have any matches, so we can’t light a fire.
→ If _______________________
8. The boy is so young that he can’t go to school.
→ If ________________________
9. If I won a big prize in a lottery, I’d give up my job.
→ Unless _____________________
10. He would not write unless he heard some news. (if)
→ He_________________________
11. I can’t look the word up because I don’t have a dictionary.
→ If _________________________
12. He doesn’t finish his homework so he is punished by the teacher.
→ If __________________________
13. The weather is not fine; that’s why we can’t go out.
→ If __________________________
14. I drink too much strong coffee; that’s why I can’t sleep.
→ If ___________________________
15. He doesn’t take any exercises. He is so unhealthy.
→ If ___________________________
16. The heavy rain prevents everybody from going out.
→ If ____________________________
17. Without the sun, man would live in the darkness.
→ If ____________________________
18. Without the air, we would die.
→ If _____________________________
19. Smoking makes him cough too much.
→ If _______________________________
20. Why don’t you study hard?
→ If __________________________