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

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

3/ If I had known her number, I would ring her up.

4/ If I had known the answer, I could tell you.

5/ If we had a map, we wouldn't get lost.

6/ If Susan didn't eat four cream cakes, she wouldn't feel sick.

7/ If there isn't a treatment, the patient will die.

8/ If he was early every day, he wouldn't lose his job.

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

10/ If Robert didn't start smoking cigarettes, he wouldn't get a bag cough.

This is the answer:

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

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

3. If I had known her number, I would ring her up.

4. If I had known the answer, I could tell you.

5. If we had a map, we wouldn't get lost.

6. If Susan didn't eat four cream cakes, she wouldn't feel sick.

7. If there isn't a treatment, the patient will die.

8. If he was early every day, he wouldn't lose his job.

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

10. If Robert didn't start smoking cigarettes, he wouldn't get a bag cough.

good study!!!