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1. If you don't do your exercise, you will fail the exam.
Unless you do your exercise, you will fail the exam.
2. If you don't save some money, you won't be able to buy the house.
Unless you save some money, you won't be able to buy the house.
3. If you don't behave yourself, your parents will be very unhappy.
Unless you behave yourself, your parents will be very unhappy.
4. If you don't do it carefully, you'll feel sorry afterwards.
Unless you do it carefully, you'll feel sory afterwards.
5. If you don't ask him first, he won't offer to help.
Unless you ask him first, he won't offer to help.
Câu đk loại 1 : If S Vs/es, S will (not) V
Unless ~ if not