9. He will be careful if he crosses the street.
10. If you come to my party, I will be happy.
11. If you study hard, you will be clever.
12. If he crosses the street, he will be careful.
13. I will answer the question if I am smart.
14. Cindy will cry if she is sad.
15. Tom will buy a cara if he is rich.
16. If I am smart, I will answer th question.
17. If CIndy is sad, she will cry.
18. If they are hungry, they will eat much food.