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.