状语从句可分为：
时间状语从句、 地点状语从句、
原因状语从句、 目的状语从句、
结果状语从句、 条件状语从句、
让步状语从句
状语从句有其相对独立的一套连词,连词本身带有自己的意思.
一.时间状语从句
引导时间状语从句的从属连词很多,如较基本的有before,after,when,while,as,since,till,until,as soon as
此外还有有一些（杂牌）连词,也能起连接句子的作用,如：the moment,the minute,the second,immediately,directly,instantly,once,no sooner…than,hardly…when[一……就]; every time(每次),each time(每次),the first time(第一次)
eg:Immediately he came I told him the news.他一来我就把消息告诉了The moment I saw him I knew there was no hope.我一看到他就知道没希望了.
He felt nervous each time she spoke to him.每次她和他讲话,他都感到紧张.
※ 时间状语的一些常见结构
1.… was/were doing … when …
…was/ were about to do … when…
was/were on the point of doing…when
2.It was/will be +段时间+before
①(肯定句) 过多久… 就/才
②(否定句) 不久…就/才
eg:It will be one year before we graduate from middle school.
3.It is+段时间+since +句子(一般过去时)
① (短暂动词) 自…以来已经多久了
② (延续动词)自...以来过久没… 了
eg:It is six years since I graduated.
4.It is + 时间点 + when …
当……时已是 …..时间了
二.条件状语从句引导条件状语从句的从属连词主要有 if,unless,as [so] long as,in case,if only等.
eg:Don’t come unless I telephone.
除非我打电话,否则你别来.
If you watch carefully you will see how to do it.
如果你仔细瞧你会看出该怎样做.
As long as you do your best,we’ll be happy.只要你尽力,我们就满意了.
If only(==I wish) I were a bird.
三.让步状语从句
1.引导让步状语从句的从属连词主要有 although,though,however (=no matter how),even if(即使),whether…or(不论…还是),whatever,whoever,whenever,wherever [no matter what/who/how/where] 等引导让步状语从句.如：
eg:Although he is poor,he’s still happy.虽然他很穷,他仍然很快乐.
I will try it,though I may fail.即使我可能失败,我也要试一下.
I’ll do it whether you like it or not.不管你是否喜欢,我都要做.
※ as 也可引导让步状语从句,但句子语序特殊,要将名词、形容词或副词等提到 as 前,若提前的是单数可数名词,要省略 a / an.如：
eg:Young as he is,he knows a lot.
Teacher as he is,he can’t know everything.虽然是老师,他也不可能什么都懂
四.原因状语从句
1.引导原因状语从句的从属连词主要有because,as,since,seeing (that),now (that),for等：
eg:They can’t have gone out because the light’s on.他们不可能出去了,因为灯还亮着.
Since you are going,I will go.
既然你去,我也去.
Now that we are alone,we can speak freely.现在我们单独在一起,可以随便谈了.
五.地点状语从句
引导地点状语从句的从属连词主要有where (在…的地方),wherever(无论什么地方),everywhere(每个…地方),anywhere(任何…地方).如：
eg:Where there is a river,there is always a city.
I’m not living where I was.我不在原处住了.
没有with引导的从句,而是with由它自己的用法
你自己看看他的用法
