學習語法首先要學習句子,因為句子是人類語言的核心,通過對句子的分析理解,可以更好的掌握語法。下面是小編整理的考研英語四級重點語法知識之條件狀語從句,希望對你的語法學習有所幫助!
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化為 If you dong leave immediately, you will be late. B、D句意不對,or表轉折,句子如為 You leave immediately or you will be late.