chuyển cac câu sau sang If và Unless
1. do your exercise or you will fail the exam.
-> If you don't do your exercise, you'll fail the exam
2. Save some money or you won't able to buy the house.
-> Unless you save some money, you'll able to buy the house
3. behave yourself or your parents will be very unhappy.
-> If you don't behave yourself, your parents will be very unhappy
4. do it carefully or you will feel sorry afterwards
-> Unless you do it carefully, you won't feel sorry afterwards
5. Ask him first or he won't offer to help.
-> If you don't ask him first, he won't offer to help
6. be calm or you'll make a wrong desicion
-> Unless you are calming, you'll make a right desicion
7. be careful or you'll cut yourself with that knife
-> If you aren't careful, you'll cut yourself with that knife

1.If you don't do your exercise, you'll fail the exam
2 Unless you save some money, you'll able to buy the house
3. If you don't behave yourself, your parents will be very unhappy
4. Unless you do it carefully, you won't feel sorry afterwards
5. If you don't ask him first, he won't offer to help
6. Unless you are calming, you'll make a right desicion
7. If you aren't careful, you'll cut yourself with that knife