状语从句
状语从句一般分为九大类
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
条件状语从句方式状语从句比较状语从句让步状语从句
(一)．时间状语从句
常见的从属连词有：(注意其汉语意义)
when, while, as, before, after, since, until (till), once, as soon as, the moment, the minute, immediately, directly, each/every time, the first time, the last time, next time, by the time, whenever等。

如：
When I got to the airport, the plane had already taken off.
When I lived there, I used to go to the seaside on Sundays.
（二）．条件状语从句
常见的从属连词有：
if, unless, as/so long as , as/so far as, on condition that , in case(以防；万一) , the more…, the more…等。

如：
If it rains, you can call me.
Don’t call me unless it rains.
（三）．原因状语从句
常见的从属连词有：because, since, now that, as等。

如：
Since everybody is here, let’s begin our meeting．
It must have rained last night, for the ground is wet．
（四）．让步状语从句
常见的从属连词有：
though, although, as, even if / though, no matter wh-，wh-ever, whether…or…等。

如：
However late he is, his family will wait for him to have dinner together.
Whether it is fine or not, I will go boating．
（五）．地点状语从句
常见的从属连词有：
where, wherever等。

如：
Put the book where it is．
Wherever you are, take your cellphone.
（七）．方式状语从句
常见的从属连词有：
as , as if / though 等．
如：
He talks about the moon as if he had been there．(从句动作先发生)
She treated the boy as if he were/was her own child．(主从句动作同时发生)
（八）．目的状语从句
常见的从属连词有：
so that, that, in order that，in case (以免), for fear that等。

如：
Most students go to college so that they can be engineers, teachers or chemists．
（九）．结果状语从句
常见的从属连词有：
so…that, such…that等。

如：
It is such fine weather that we all want to go to the park.
Tom studied very hard so that he passed the exam.。