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一、状语从句的概述
（一）状语从句的含义：一个句子作状语。什么是状语呢？“不可名状”状指描述的意思。故状语就是表示描述性的信息。
（二）状语从句的写法
主句 + 从属连词+完整的陈述句。从属连词后面的句子是完整的句子不缺成分，从属连词指表示描述清楚逻辑关系，不作成分。
例如:When the United States built its industrial infrastructure,it didn"t have the capital to do so.
When 表示当xx时候。
We did not evolve,because machines and society did it for us.
because 表示原因的逻辑关系。
（三）状语从句的位置
因为状语从句为主句服务，故状语从句可放在句首/句末/句中。
例如:As the economy picks up,opportunities will abound for aspiring leaders.
As the economy picks up放在主句的前面。
Opportunities will abound for aspinng leaders, as the economy picks up.
as the economy picks up放在主句的后面。
Opportunities，as the economy picks up，will abound for aspinng leaders.
as the economy picks up放在句子中间。注意：插入句中一般放在主谓之间。这种不推荐自己书写时使用。但是要注意在翻译和阅读题目中要出现，用来提升试题难度。
二、状语从句的分类
从写法上来推测分类。从属连词表示什么逻辑关系，那么就叫什么状语从句。例如上面的because表示原因的逻辑关系，故该状语从句叫原因状语从句。只关心从属连词的逻辑关系就可以分清状语从句了。
分为9类：时间、地点、原因、结果、目的、条件、让步、比较、方式。
最常用的是5中：条件、让步、时间、结果、原因
（一）时间状语从句
就是在完整陈述句前加表示时间的从属连词就构成了时间状语从句。
例如：用when作从属连词
But in some cases,one marketer"s owned media become another marketer"s paid media-for instance,when an e-commerce retailer sells ad space on its Web site.
用while作从属连词
In 1995 the United States can look back on five years of solid growth while Japan has been struggiling.
用as作从属连词
As the brain fades,we refer to these occurrences as "senior moments."
用before作从属连词
Carter sifted through rubble in the Valley of the Kings for seven years before he located the tomb in 1922.
after作从属连词
Witness payments became an issue after West was sentenced to 10 life sentences in 1995.
since作从属连词
And since the first Internet gambling site was created in 1995,competition for gamblers" dollars has become intense.
until作从属连词
Grammar,punctuation,and spelling can wait until you revise.
As soon as作从属连词，后面要接句子。as soon as A，B。A一就B的意思
As soon as that report runs, we"ll suddenly get 500 new internet sign-ups from Ukraine ...
by the time,截止到xx时候。作从属连词（用法比较少）each time等都可以哦
... by the time 100 percent of the evidence is in it may be too late.
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