1. If you don't keep silent, you'll wake the baby up.
2. If you left inmediately, I wouldn't call a guard.
3. If I knew her number, I would ring her up.
4. If you don't go right now, you'll be late for the train.
5. If you are not be careful, you'll cut yourself with that knife.
6. If she wasn't often absent from class, she could keep pace with her classmates
7. If I had known Alice's address, I could write to her.
8. If it weren't very cold, we could go swimming.
9. If we had a map, we wouldn't have got lost.
10. If you didn't drink too much coffee , you could sleep.