12. I will give you a present if you get good marks ___________________________________________________________________ 13. O

12. I will give you a present if you get good marks
___________________________________________________________________
13. Our gardener won´t cut the grass if it rains tomorrow.
___________________________________________________________________
14. If we don´t do the homework, our teacher will be pleased.
___________________________________________________________________
15. Unless you hurry, you won´t arrive on time.
___________________________________________________________________
16. Unless it rains, we will go camping.
___________________________________________________________________
17. If their friends don´t have a spare room, they will stay in a hotel.
___________________________________________________________________
18. I will forget to post the letter if you don´t remind me
___________________________________________________________________
19. If you don´t exercise, you will get fat.
___________________________________________________________________
20. Unless she books the tickets, she won´t go to the concert.
___________________________________________________________________
21. If she doesn´t apologize, I will never speak to her again.
___________________________________________________________________
22. I will call the police if they don´t stop fighting.
__________________________________________________________________