1. If the boys play with the ball in the kitchen, they will clean all the dishes.
2. I'll write to you tomorrow If I have free time.
3. If you play in this quest house, you will enjoy it very much.
4. Sara will be sad if she doesn't receive any letter from you.
5. If you will get an accident, call the police.
6. You will get sunstroke if you go out without a hat.
7. If you go to bed early, you will get up better in the morning.
(насчет 3-го я не уверен)