unless和if的關係

unless的用法

l Unless 是從屬連接詞，引導副詞子句，表「除非~否則~」，通常作條件句，表示未來時態時，從屬子句須用現在簡單式，被修飾的主要子句則用未來式 ，不可與or連用

F Unless S + V…, S + V （除非…否則~）

= S + V unless S + V

EX: I will not go unless you go with me.

EX: Unless you study harder, you will not succeed.

l If, when, once, as long as…等亦可引導條件句，亦採相同構句

EX: If/ When/ Once/ As long as I have money, I will buy a car.

l Unless = if…not

EX: Unless you study hard, you will fail the exam.

= If you do not study hard, you will fail the exam.

EX: Unless it rains hard, I will not stay at home.

= If it does not rain hard, I will not stay at home.

reference: 英檢初級寫作（English Writing）(Instructor: Joyce )
www.vghks.gov.tw/