IF/UNLESS

1. Unless Sammy feels well, he won’t go to school.
2. If you don’t water the plants, they will die. 
3. We will go bicycle riding this afternoon unless it rains. 
4. Unless the boy behaves himself, he won’t go to the cinema
5. He will be very tired unless he has a rest
6. If she doesn’t phone me, I won’t phone her. 
7. David will not buy a car if he doesn't pass his driving test.