1) If I have the time, I shall study more.
2) He will tell you if he knows the answer.
3) If you love me, you will buy some roses.
4) If she feel ill, she will not go to work.
5) If I don't have homework, I shall watch TV.
6) If you call him, he will come immediately.
7) We shall have fun if we go to the cinema.
8) He will catch a cold if he doesn't put on your raincoat.
9) What will happen to our planet if we don't protect Nature?