1 If you don't study hard, you will fail in the entrance exam
2 If he works hard, he will pass the exam
3 If she doesn't hurry up, she will miss the train
4 If you don't practice speaking everyday, you can't improve your English
5 If we recycle, we will save natural resources
6 Unless you rest, you really will be ill
7 If you are calm, everything will be all right
8 If you aren't careful, you will break the vase
9 If you don't start at once, you will be late for school
10 If you travel a lot you will know more about my beautiful country
11 If I have free time tomorrow, I will go out with you
12 If students don't litter, your school yarrd will be clean
13 If you promise to return the book back next week, i will let you borrow it
14 If the sea gets warmer, the ice at North and south Poles will melt
15 If you work too much, you will be tired
