1. Unless you practice harder, you will lose in the next game.
2. Unless Nam speaks English everyday, he will easily forget how to use it.
3. If our team hadn't joined the competition, we would not have achieved this prize.
4. Unless students return books to the library this week, they’ll have to pay a fine.
5. Unless Peter studied hard, he could not get high marks.
( If : Nếu , Unless : Nếu không )
* Viết lại câu If -> Unless
Thay If= Unless , giữ nguyên 1 vế và trái vế còn lại.
( Đảm bảo vế sau Unless -> không có not )