五年级英语之条件状语从句

　　条件状语从句的五年级英语知识点：

　　  
条件状语从句连接词主要有 if, unless, as/so long as, on condition that 等。.
if 引导的条件句有切实前提句跟非实在条件句两种。非真实条件句已在虚构语气中阐述。

unless = if not（两者有时可以通用）.　
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.

五年级英语典型例题
You will be late ___ you leave immediately.　
A. unless　 B. until　 C. if　　D. or
答案A。 这句五年级英语例句句意为：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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