ap an. 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.... 3. I don't know her number, so I don't ring her up. -lf.... 4. I don't know the answer, so I can't tell you. If. 5. We got lost because we didn't have a map. If 6. Susan felt sick because she ate four cream cakes. 7. Without this treatment, the patient would have died. ....... 8. He lost his job because he was late every day. 9. Peter is fat because he eats so many chips. 10. Robert got a bad cough because he started smoking cigarettes.

`~rai~`

$\begin{array}{I}\text{2.If you don't stop talking,you won't understand the lesson.}\\\text{3.If I knew her number,I would ring her up.}\\\text{4.If I knew the answer,I could tell you.}\\\text{5.If we had had a map,we wouldn't have got lost}\\\text{6.If Susan hadn't eaten four cream cakes,she wouldn't have felt sick.}\\\text{7.If the patient hadn't had this treatment,he would have died.}\\\text{8.If he hadn't been late every day,he wouldn't have lost his job.}\\\text{9.If Peter didn't eat so many chips,he wouldn't be fat.}\\\text{10.If Robert hadn't started smoking cigarettes,he wouldn't have got a bad cough.}\end{array}$