高考英语语法：条件状语从句
新东方网高考频道整理高考必备英语语法大全，内容是高考英语状语从句的分类解析，在高考英语写作和阅读、选择填空时都经常遇到，更多高考英语语法在：gaokao.xdf.cn。条件状语从句
连接词主要有 if, unless, as/so long as, on condition that 等。.
if 引导的条件句有真实条件句和非真实条件句两种。非真实条件句已在虚拟语气中阐述。
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.
典型例题
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，否则你就回迟到的。可转化为 If you dong leave immediately, you will be
late. B、D句意不对，or表转折，句子如为 You leave immediately or you will be late.
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