1. Unless we leave now, we will miss the plane.

2. Unless you get good marks, I will not give you a present.

3. Unless it does not rain tomorrow, our gardener will cut the grass.

4. Unless we do the homework, our teacher will not be pleased.

5. If you do not hurry, you won't arrive on time.

6. If it does not rain, we will go camping.

7. Unless their friends have a spare room, they will stay in a hotel.

8. Unless you remind me, I will forget to post the letter.

9. Unless you exercise, you will get fat.

10. If she does not book the tickets, she won't go to the concert.

11. Unless she apologises, I will never speak to her again.

12. Unless they stop fighting, I will call the police.