1.Unless you study harder, you won't fail the next exam
2.Unless he practices writing every day, he can't improve his writing skill
3.If this man isn't a driver, he won't you move by car
4.If you don't go out more often,you might not fall ill
5.Unless you return this book to the library today, you won't have to pay a fine.
Công thức:
Unless + S + V (simple present), S + will/can/shall+(not) + V
Unless=if not