状语从句指句子用作状语时，起副词作用的句子。它可以修饰谓语、非谓语动词、定语、状语或整个句子。
根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。状语从句一般由连词（从属连词）引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。
【考点聚焦】
注意状语从句中从句的省略现象
(1)连接词 + 过去分词
Don't speak until spoken to.
Pressure can be incrased when needed.
Unless repaired, the washing machine is no use.
(2)连词 + 现在分词
Look out while crossing the street.
(3)连词 + 形容词/其他
常见的有it necessary、if possible、when necessary、if any等.
【练习】
1. I don't think I'll need any money but I'll bring some ____________.
case again time
解析：答案为B。句意为“带些钱以防万一”，只能选择incase。引导的条件状语从句，后面省略了I should need it.
2. The WTO can't live up to its name_________ it doesn't include a country that is home to one fifth ofman-kind.
long as ough
解析：答案为C。本题考查状语从句的用法。句意为“假如世贸组织不包括占世界人口五分之一的中国的话，那它就名不副实”。aslong as语气过于强烈，while和even though不符合句意。
3. Someone called me up in the middleof the night, but they hung up_________I could answer the phone.
解析：答案为C。题意为：半夜里有人打来电话，我没来得及就挂了。but暗示在接话前就挂了。
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