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1. If she is lazy, she will fail her exam.
2. If you are not careful, you won't get good marks.
3. If he drives to work, he will destroy the air.
4. If she is hard working, everyone will love her.
5. If she studies well, her mother will be satisfied.
6. If you walk to school, you will be "green".
7. If you use reusable bags for shopping, you won't produce much rubbish.
8. If you pay attention to the lesson, you will do the tests better.
9. If you pay attention to school, the teachers will be happier.
10. If you are good student, your parents will be satisfied.
11. If we walk or cycle to school, the environment will be fresher.
12. If we throw rubbish into the rivers, fish will die.