If you don't raise your hand, I will kill you
Unless you raise your hand, I won't kill you.

`1.` If we don't hurry up, we will miss the bus.

Unless we hurry up, we won't miss the bus.

`2.` If you don't do the test carefully, you may get bad mark.

Unless you do the test carefully, you may not get bad mark.

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Để nói về sự việc có thể diễn ra ở hiện tại hoặc tương lai, ta dùng câu điều kiện loại 1

Cấu trúc: If/Unless+S+V(htđ)+..., S+will/can/may/shall+Vinf+...

Khi chuyển if thành unless, ta chuyển thể của một trong 2 mệnh đề (if và chính) sao cho mệnh đề if ở thể khẳng định.

If you didn't raise your hand, I would kill you 
Unless you raised your hand, I would kill you 

cấu trúc: Unless + S +Ved / V2 (simple past), S+ would + V= If+ S+ not + quá khứ đơn, S+ would + V

1. If we didn't hurry up, we would miss the bus

Unless we  hurried up, we would miss the bus

cấu trúc: Unless + S +Ved / V2 (simple past), S+ would + V= If+ S+ not + quá khứ đơn, S+ would + V

2. If you didn't do the test carefully,  you might get bad mark.

Unless you did the test carefully, you might get bad mark.

cấu trúc: Unless + S +Ved / V2 (simple past), S+ might + V= If+ S+ not + quá khứ đơn, S+ might + V