英語語法大全之條件狀語從句
條件狀語從句
連接詞主要有 if, unless, as/so long as, on condition that 等。.
if 引導的條件句有真實條件句和非真實條件句兩種。非真實條件句已在虛擬語氣中闡述。
unless = if not.
Let's go out for a walk unless you are too tired.
If you are not too tied, let's go out for a walk.
典型例題
You will be late ___ you leave immediately.
A. unless B. until C. if D. or
答案A。 句意：除非你立即走，否則你就回遲到的�？赊D(zhuǎn)化為 If you dong leave immediately, you will be late. B、D句意不對，or表轉(zhuǎn)折，句子如為 You leave immediately or you will be late.
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