1. Unless you study harder, you'll get bad marks
2. If this man isn't a driver, he can't help you move by car
3.Unless he practices writing everyday, he can't improve his writing skill
4.If you don't return this book to the library today, you will have to pay a fine
5.If you don't go out more often, you might fall ill
6.Unless you aren't absent from school, you have to write a sick-note
7.If the seas isn't warmer, the ice at the North and South pole will not melt
