1. If you don’t study harder, you ‘ll fail the next exam. => Unless ……………………………………………………………….. 2. If he doesn’t practice writing every day, he can’t improve his writing skill. => Unless ……………………………………………………………….. 3. Unless this man is a driver, he can’t help you move by car. => If ……………………………………………………………….. 4. Unless you go out more often, you might fall ill. => If ……………………………………………………………….. 5. If you don’t return this book to the library today, you’ll have to pay a fine. => Unless ……………………………………………………………….. 6. Unless he cleaned up the car now, his boss could ask him to do this. => If ………………………………………………………………… 7. Unless they were absent now, they would meet the headmaster. => If ………………………………………………………………… 8. If I didn’t know the number, I would not ring her up. => Unless ………………………………………………………………… 9. If my sister didn’t have a terrible headache she wouldn’t be absent from her class. => Unless ………………………………………………………………… 10. If Peter didn’t study hard, he could not get good marks. => Unless ……………………………………………………………

`1.`If you don't study harder, you‘ll fail the next exam.

`->` Unless you study harder, you‘ll fail the next exam.

`2. `If he doesn't practice writing every day, he can't improve his writing skill.

`->` Unless he practices writing every day, he can't improve his writing skill

`3.`Unless this man is a driver, he can’t help you move by car. 

`->` If this man is not a driver, he can’t help you move by car.

`4. `Unless you go out more often, you might fall ill.

`->` If you go out more often, you might fall ill.

`5.` If you don’t return this book to the library today, you’ll have to pay a fine.

`->` Unless you return this book to the library today, you’ll have to pay a fine.

`6.` Unless he cleaned up the car now, his boss could ask him to do this.

`->` If he didn’t clean up the car now, his boss could ask him to do this.

`7.` Unless they were absent now, they would meet the headmaster.

`->` If they were not absent now, they would meet the headmaster.

`8.` If I didn’t know the number, I would not ring her up.

`->` Unless I knew the number, I wouldn't ring her up.

`9`. If my sister didn’t have a terrible headache she wouldn’t be absent from her class.

`->` Unless my sister had a terrible headache, she wouldn’t be absent from her class.

`10.` If Peter didn’t study hard, he could not get good marks.

`->` Unless Peter studied hard, he couldn't get good marks.

- If + S + V(s/es) + ...,S+ will/can/... (+not) + V(o) + ...

- If + S + V2/V-ed+ ...,S + would/could/... (+not) + V(o) + ....

- If + S + had + VpII + ...S + would/could/... + have + VpII + ...

- Unless = If...not = Trừ khi