viết lại câu có sử dụng unless=if...not 1.If you don't study harder, you 'll get bad marks. => Unless .......................................................................... 2.Unless this man is a driver, he can’t help you move by car. ................................................................................................................................. 3. If he doesn't practice writing every day, he can't improve his writing skill. => Unless .......................................................................... 4. Unless you return this book to the library today, you’ll have to pay a fine. => If .......................................................................... 5. Unless you go out more often, you might fall ill. => If .......................................................................... 6. If you are absent from school, you have to write a sick-note. => Unless .......................................................................... 7. Unless the seas is warmer, the ice at the North and South pole will not melt. => If ..........................................................................