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时间状语从句：
状语从句需要连词引导。引导时间状语从句的连词有： when，while，as，as soon as，before，once，after， since，till/until等。 例如：
When you finish doing this drill, you may go on to the next one.
I'll let you know as soon as it is settled.
She has written fifty letters home since she came to Beijing.
注意（一）：
虽然till和until可互相交换使用。但在句首只能用until。
用于否定句时，表示“直到…时，才…”；“在…以前，不…”例如：
Until you told me about the book I had no idea of it.
（在你告诉我之前，我对此书一无所知。）
I won't know where he is until I get a letter from him.
（收到他的信时我才知道他在那里。）
时间状态语从句中用一般现在时表示将来时间，用现在完成时表示将来完成时间。例如：
As soon as my brother arrives, we'll start working.
while和as的区别：when表示从句动作与主句动作同时发生或先于主句动作，可以指一段时间也可以指特定的时间点；while表示从句动作与主句动作同时发生，表示“一边…一边…”，通常指一段时间。
例如：
Jack stayed with us when /while he was in Beijing.
He called us when he arrived in Beijing.
地点状语从句：
引导地点状语从句的有where，wherever，everywher等连词。例如：
Where there is a will, there is a way. （有志者 事竟成）
Wherever you met him, it was not in my house.
Everywhere he goes he makes new friends.
Everywhere she went, she was kindly received.
条件状语从句：
一般由if（如果），unless（除非，如果不），as/so long as(只要)等连词引导。例如：
Please come by if you are free.
Unless you study harder, you're going to fail the exam.
注意（二）：
条件状语从句中也须用一般现在时表示将来时间，用现在完成时表示将来完成时间。例如：
If it rains tomorrow, we won't go hiking.
原因状语从句：
引导原因状语从句的连接词通常有because（因为），as（由于），Since（由于），now that（既然；由于）等。例如：
As it is raining, you had better take your umbrella with you.
You must tell the truth since you know the fact.
She couldn't get up because her legs were wounded.
I can't go to the movie because I'm too busy.
注意（三）：
because,as和since均可指原因，但because引导的从句常位于主句之前；而as和since引导的句常位于主句之前；because表示原因的语气最强，而as和since语气较弱，只是附带说明一下主句内容是由从句引起的结果。as和since常指说话人和听话人双方都知道的原因。当回答以why引导的疑问 句时必须用because。例如：
Why didn't you come to the meeting?
Because I had a bad cold.
结果状语从句
结果状语从句一般由so…that（如此…以致于），such…that（如此…以致于），such that(如此… 以致于）和so that（以致于）等引导。so…that与such…that的区别在于：so接形容词或副词，such接名词或名词词组。例如:
He was so excited that he couldn't help jumping.
She spoke so loudly that every one in the big hall can hear her.
It was such a terrible accident that few people survived.
There were so few students present that the class was cancelled.
The book was written in such simple English that we could understand it easily.
目的状语从句一般由so that （为了；以便）和in order that （为了；以便）引导的目的状语从句，lest 表示“免得/以防/以免”。从句中一般用虚拟语气，动词形式 为“should+ 动词原形”。
She speak louder so that everyone in the hall sould hear her.
They sent the book by air mail in order that it might reach us in good time.
The teacher hid the key to exercises lest the students should see it.
We set off early lest we should be late.
让步状语从句：
让步状语从句常用although/though（虽然），even though/even if（尽管），as（尽管），whatever/whenever/however（无论什么/何时/如何），no matter what/when/how（无论什么/何时/如何）等到引导。no matter what/when/how（无论什么/何时/如何）等引导。as表示让步时一般用于部分倒装结构，though也有此 用法。例如：
We'll try our best to finish the work in time though we are short of materials.
He still wanted to do it although I warned him not to.
Although she slept ten hours last night,she is still tired.
Although the road was narrow, the driver managed to pass it safely.
方式状语从句:
方式状态语从句常由as if/as though（好像，如同）等。例如：
She acted as if/though nothing had happened.
She always talks to him as if she were/was his sister.
It looks as if it'll rain.
He treats me as if I am/were his brother.
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