1. If you don't keep silent you will wake the baby up.
2. If you leave immediately I won't call the police.
3. If I knew her phone number I would ring her up.
4. If you don't go right now you will be late for the train.
5. If she weren't absent from class she could keep pace with her classmate.
6. If I had known alice's address I could have written to her.
7. If I knew the answer I could tell you.
8. If we had had a map we wouldn't have got lost.
9. If his friends hadn't been so late they wouldn't have missed the train.
10. If today were sunday the pupils could go swimming.
