when的特殊用法：when引导的时间状语从句，如果主句和从句主语一致，并且从句的谓语中有be动词，此时从句中的主语和be可以一起省略。e.g.When I was a little girl,Iove Jeff so much.→When a little gril,I love Jeff so much.
区分untill和not...untille.g.I will wait here untill you come.I will not leave untill you come.
地点状语从句
常用引导词：where。不常用引导词：wherever,anywhere,anywhere
e.g.这种花在潮湿的地方生长的很好。The flower grows well where it is moist.
原因状语从句
常用引导词：seeing that,now that,in that, considering that,given that,as much as,so much as等
e.g.因为他粗心，他昨天除了一场车祸。Because of his careless,he had a car accident yesterday.
目的状语从句
常用引导词：so that,in order that等
常见的动词不定式也可表目的：to, in order to,so as to.
e.g.I am determined to take part in the examination of postgrauates so that I could have a brighter future.
结果状语从句
常见引导词：so...that,such...that等
e.g.He is such a proud man that we fail to love him. such后跟名词（短语）he is so proud that we fail to love him. so后跟形容词（短语）或副词（短语）
条件状语从句
常用引导词：if,unless
特殊引导词：as/so long as(只要)，only if（只要）,providing/provided that（假如）
e.g.I will nerver give up so long as there is a ghost of hope.只要有一丝希望，我也不放弃
让步状语从句
常用引导词：though,although,even if,even though等
特殊引导词：as,while(作虽然之意，用在句首）,no matter...(无论）,in spite of the fact that（虽然、尽管）,whatever,whoever,wherever,whenever,however,whichever等
e.g.Pollution becomes increasingly serious although a sea of adults fail to realize it.
方式状语从句
常用引导词：as,as if, as though等
特殊引导词：the way
e.g.She talks with me as she is my mother.他和我妈说话的样子好像一样。
比较状语从句
常用引导词：as,than等
特殊引导词：the more...the more...,more than,more...than,no so much...as...等
e.g.Gong Li look as graceful as a red rose,who can take many people's breath away.
IV. 分词做状语
V. 状语和状语从句的应用
写作
拉长句子：I am reading the book written by Liu.
加副词：I am reading the book written by Liu diligently.
加时间：I am reading the book written by Liu at the moment.
加地点：I am reading the book written by Liu either on the playground or in the street.
加原因：I am reading the book written by Liu because it is so interesting and attractive.
