1. If you aren't calm , you'll make mistakes .

2. If Mary doesn't her work , her mother will get angry .

3. If I don't know her phone number , I won't call her .

4. If he drove fast , he had an accident .

5. If the boy hadn't broken his leg , he'd have taken past in the game .

6. If Susan got a bad mark , she felt sad .

7. If he didn't come early , he didn't meet her .

8. If he behaves badly to his friends , they don't love him .

9. If whenever he has free time , my dad often will clear the room .

10. If he didn't have a map , robot got lost .

11. If you aren't calm, you'll make mistakes.

12. If Mary doesn't do the homework, her mom will get angry.

13. If I knew her phone number, I would call her.

14. If he hadn't driven fast, he wouldn't have had an accident.

15. If the boy hadn't broken his leg, he 'd have taken part in the game.

16. If Susan hadn't gotten a bad mark, she wouldn't have felt sad.

17. If he had come early, he would have met her.

18. If he didn't behave badly to his friend, they would love him.

19. If my dad has free time, he will clean the room.

20. If Robert had had a map, he wouldn't have gotten lost.