1. Keep silent or you’ll wake the baby up.

→ If you

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

→ If you

3. Don’t throw trash into the river, or the water will be polluted.

à If you

4. I don’t know her number, so I don’t ring her up.

→If I

5. I don’t know the answer, so I can’t tell you.

→ If  I

6. The water is seriously dirty, so fish die

àIf the water

7. We will get lost because we don’t have a map.

→ If we

8. Susan can be sick because she eats four cream cakes.

→ If Susan

9. Because the weather is not fine, we don’t go on a picnic.

→ If the weather

10. Keep the water clean, and we will have enough water for future use.

→ If we

11. Peter is fat because he eats so many chips.

→ If Peter

12. Water the tree regularly, and it will grow well.

→ If you

13. Unless you finish your homework, you can’t go out tonight.

à If you

14. Unless they were out, they would help me.

à If they

15. He couldn’t win the game unless he practiced more.

à If he