1. If you don't keep silent, you will wake the baby up.

2. If you don't stop talking, you won't understand the lesson.

3. If I knew her number, I would ring her up

4. If I knew the answer, I would tell you.

5. If we had had the map, we wouldn't have got lost.

6. If Susan hadn't eaten four cream cakes, she wouldn't have felt sick.

7. If it hadn't been for this treatment. the patient would have died.

8. If he hadn't been late every day, he wouldn't have lost his job.

9. If Peter didn't eat so many chips, he wouldn't be fat.

10. If Robert hadn't smoked, he wouldn't have got a bad cough.

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

⇒If you don't keep silent, you will wake the baby up.

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

⇒If you don't stop talking, you won't understand the lesson

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

⇒If I knew her number, I would ring her up

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

⇒If I knew the answer, I would tell you

5. We got lost because we didn’t have a map.

⇒If we had had a map, we wouldn't have got lost

6. Susan felt sick because she ate four cream cakes.

⇒If Susan hadn't felt sick, she would have eaten four cream cakes 

7. Without this treatment, the patient would have died. 

⇒If it hadn't been for this treatment, the patient would have died

8. He lost his job because he was late every day.

⇒If he hadn't been late everyday, he wouldn't have lost his job.

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

⇒If Peter didn't eat so many chips, he wouldn't be fat

10. Robert got a bad cough because he started smoking cigarettes. 

⇒If Robert hadn't started smoking cigarettes, he wouln't have got a bad cough