从头学习英语条件状语从句的连接词

　　条件状语从句的链接词，从头学习英语重点：

 
连接词主要有 if, unless, as/so long as, on condition that 等。.
if 引导的条件句有实在条件句跟非切实条件句两种。非真实条件句已在虚构语气中阐述。重头学习英语例子：

　 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. CopyRight .com

典型例题
You will be late ___ you leave immediately.　
A. unless　 B. until　 C. if　　D. or
答案A。 从头学习英语讲解句意：除非你即时走，否则你就回迟到的。可转化为 If you dong leave immediately, you will be late.　B、D句意过错，or表转折，句子如为 You leave immediately or you will be late. 

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