1. If you're a vegetarian, you shouldn't eat meat.
2. If you live in a cold country, you won't like hot weather.
3. If you're a teacher, you should work very hard.
4. If you do a lot of exercise, you can stay fit and healthy.
5. If you're a mechanic, you will understand engines.
6. If you readnewspapers, you will know what's happening in the world.
7. If you work harder, you won't lose your job.
8. If you don't pay attention to the teacher, you won’t understand the lessons.
9. If you go to bed early, you can get up early the next morning.
10. If you don't save money now, you will be in debt in the future.
11. If you want to win a place at university, you should read more referent books
12. If you don't drive more carefully, you will have an accident.
13. If you brush your teeth often, you won't get toothache.
14. If you don't listen carefully, you won’t know what to do.
15. Unless Andrew is lazy, he will pass the final examination.
16. Unless John runs faster, he will not catch the train.
17. Unless the tree is watered every day, it will die.
18. Unless we earn lots of money, life won't be very easy.
19. Unless you practice more often, your English won’t be better.
20. Unless Jack tries to work harder, he will be dismissed