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用来修饰主句中的动词，副词和形容词的从句叫状语从句。下面就和我一起了解一下，供大家参考。
状语从句是指句子用作状语时，起副词作用的句子。状语从句中的从句可以修饰谓语、非谓语动词、定语、状语或整个句子。
状语从句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。
1.时间状语从句
（1）When---当……时候,通常指某一特定的时间点，主句与从句的动作同时发生。
（2）When---正在……的时候，突然…。通常主句是进行时或be about to时，在翻译的时候，when可以译成没想到或突然。
（3）When当从句是进行时，主句是一般时，往往表示不满。
（4）When=after
（5）While---在……期间，往往指一段时间。
（6）While---表示一种不满情绪，意思是这边在干某种重要的事，而另一边在享受等。
（7）As---一边……一边,随着
（8）The moment---一……就……=as soon as,immediately,
2.条件状语从句
引导状语从句的连接词有：If如果,unless除非,as long as只要,As(so)far as---据……所知，incase万一,provided that假如,on condition that若是，以…为条件。
3.地点状语从句
地点状语从句只有两个连词:Where,wherever。
4.原因状语从句
because,as,since,now that,和considering that,seeing that这六个连词都用于表示表示原因,但在语气上一个比一个弱。
5.结果状语从句
引导结果状语从句的连词有：that,so that,so…that…
6.目的状语从句
引导目的状语从句的主要连词有:that,so that,in order that,for fear that,lest.
7. 让步状语从句
引导让步状语从句的连词有：Although,though,as,even if,even though,no matter,however,whatever,while,whether。
8.方式状语从句
方式状语从句常由:as, as if, as though。
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从句 1、主语从句 引导词有：that,what,whether,when,wherever,who 等,主语从句的谓语动词必须用单数. 举例： 1) That he will fall the exam is certain. 2) What she said is true. 3) It doesn't matter when she leaves. 4) Whoever is tired may rest. 2、表语从句 一般位于系动词之后. 举例： The question is that I also like her. 3、宾语从句 句型：主句 + 连词 + 宾语从句 连接宾语从句的词有：that,if,whether,who,whose,what,which,where,when,why,how,whoever,whomever,whenever,wherever 等》 举例： 1) He said that he was the first to clamb to the top of the mountain. 2) I wonder if / whether you could lend me tour bike. 3) Parents shouldn't give their children whatever they want. 4) She doesn't know who will come. 5) He asked if / whether she had an apartment in the city. 6) Who do you think they will travel with? 4、状语从句 （1）时间状语从句 引导时间状语从句的连词有：when,whenever,as,while,before,after,until,till,since,ever,as soon asimmediately,directly,hardly,hardly ...when 等. 举例： 1) When I was in Shanghai,I met her. 2) Please wait until you are called. （2）地点状语从句 常由 where 何 wherever 引导. 举例： He lives where the street crosses the river. （3）原因状语从句 常由 as,because,since,now that,seeing that 等引导,其中语气最强烈的就是 because. 举例： He has to leave off because he is seriously ill. （4）条件状语从句 常由 if,unless,as long as,so long as 等引导. 举例： If you can correct your faults,your work is good. （5）目的状语从句 常由 so that,in order to 等引导. 举例： Speak loudly so that every one may hear you clearly. （6）比较状语从句 常由 than,as,as ...as 等引导. 举例： I have got as much money as I need. （7）让步状语从句 常由 though / although,even though,as,if,even if 和 wh- + -ever 复合词引导. 举例： Although I tried my best to learn English,I haven't passed the exam. （8）方式状语从句 常由 as,as if,as though,how 等引导. 举例： She looks as if she is still young. （9）结果状语从句 常由 that,so / such that 等引导. 举例： She is such a good teacher that all the students love and respect her. 5、定语从句 结构： .先行词（被修饰的名词或代词） + 关系代词 / 关系副词 + . 一般来说,修饰人用 who,whom,whose,that；修饰物用 that / which. 举例： 1) The road which through our school is very wide. 2) This is the school where my brother studies 3) Is there anything that you don't understand?.
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