IF ... NOT = UNLESS (TRỪ KHI) EX

4. - CONDITIONAL SENTENCES LI THUYET BAI TAP DAP AN
CONDITIONAL SENTENCES LI THUYET BAI TAP DAP AN
4. If ... not = Unless (trừ khi) Ex: If you don't hurry, you'll be late for school. => Unless you hurry, you'll be late for school.