1.If we don’t leave now, we will miss the plane

Unless we leave now, we will miss the plane.

2.I will give you a present, if you get good marks.

Unless you get good marks, I won’t give you a present.

3. Our gardener won't cut the grass if it rains tomorrow.

Unless it rains tomorrow, our gardener will cut the grass.

4. If we do the homework, our teacher will be pleased.

Unless we do our homework, the teacher won’t be pleased.

5. Unless you hurry, you won't arrive on time.

If you don’t hurry, you won’t arrive on time.

6. Unless it rains, we will go camping.

If it doesn’t rain, we will go camping.

7. If their friends don't have a spare room, they will stay in a hotel.

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

8. I will forget to post the letter if you don't remind me.

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

9. If you don't exercise, you will get fat.

Unless you exercise, you will get fat.

10. Unless she books the tickets, she won't go to the concert.

If she doesn’t book the tickets, she won’t go to the concert.

11. If she doesn't apologise, I will never speak to her again.

Unless she apologizes, I will never speak to her again.

12. I will call the police if they don't stop fighting.

Unless they stop fighting, I will call the police.