1. If you don't work hard, you won't pass the exam 

2, If Henry doesn't fail his examination, his parents will be happy

3, If Sue goes out this weekend, she won't have time to study. 

4. If it snows more, i will go skiing.

5, If he doesn't leave soon, he will miss the bus.

6. If you play with matches, you will hurt yourself.

$II$

1. If we all use reusable shopping bags, the enviroment will be more clean

2, If more people recycle, the world will look a lot of different

3. We will save a lot of trees if we wast paper

4. A lot of fish will die if the factory dumps the waste into the river.

5, If you have a shower instead of a bath, you will waste water.

Học tốt!!!