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1、状语从句一分类：种类连接词注意区别：时间 状语when/whenever/while/as/before/after/instantly /until/till/by the time/as soon as/hardlywhen/directly /no sooner. than/the moment/the minute/immediately 有 些表示时间的名词短语也可用来引导时间状语从 句：the minute, the moment, every time, the first time 例：The moment he reached the country, he started
2、his search.他一到达这个国家，就开始他的探寻工作。 有 些表示时间的副词也可用来引导时间状语从句： directly 例： Directly the master came in, everyone was quiet.校长一进来，大家就安静下来as 和 when、while：as, when引导短暂性动作的动词。当从句的动作发生于 主句动作之前，只能用when引导这个从句，不可用as 或while。从句表示随时间推移连词能用as,不用 when 或 while otill/until 和 nottill/until：Until可用于句首，而till通常不用于句首。地点 状语wher
3、e/whereverwhere, 表示杲一个；wherever，表示任何一个。原因 状语Because/as/since/now that/forbecause 和 since、for、as、now that：because语势最强，用来说明人所不知的原因，回答why 提出的问题。当原因是显而易见的或已为人们所知，就 用as或since。由because引导的从句如果放在句末， 且前面有逗号，则可以用for来代替。但如果不是说明 直接原因，而是多种情况加以推断，就只能用for。now that都表示“既然now that定要是现在发生的，since 可以是现在，也可以是过去和现在。条件 状语i
4、f/unless/once/in case/as long as/on condition that多用一般时态，如果表示一般将来的情况，就用一般现 在时，如果表示过去将来的情况，就用一般过去时。目的 状语（so） that/in order that/for fear that/in case/lestso that 和 in order that 后常接 may, should, could, would 等情态动词结果 状语so.that, such.that其规律由so与such的不同词性决定。such是形容词， 修饰名词或名词词组，so是副词，只能修饰形容词或 副词。so还可与表示数
5、量的形容词many, few, much, little连用，形成固定搭配。比较 状语Than/as.as，not so/asas/the more.the more方式 状语as if, as though, as, （just）as-so，as if和as though引导的从句一般用虚拟语气。让步 状语Though/although/even if/even though/as， no matter what/who/which/how/when，whatever/whoever /whichever/however/whenever，whether-or-（不管 都）as在让步状语从句
6、中常用倒装形式;although和though 用正常语序，可和yet连用，但不可和but连用时间状语从句：when （当的时候）while （在期间）as （当的时候, 一边一边）before （在之前）since （自从以来）till/until （直到）hardlywhen （刚. 就）as soon as（一就） after （在之后）not.till/until （直到才）no sooner.than.（冈 0. 就）地点状语从句： where （在那里）wherever（无论哪里）原因状语从句：because （因为）since （因为，既然）as （由于）for （为了）now
7、that （既然）目的状语从句：（so） that=in order that （以便）so as （not） to （以便不）in case （以免） lest （以免）结果状语从句： so+adj/adv.+that （如此以致） so that （结果）such+n.+that （如果以致）that （所以，因此）让步状语从句：though/although不可同but连用。though/although （虽然）however （可是）even though （即使） even if（即使）no matter+what/which/where/who/when =whatever/wh
8、ichever/wherever/whoever/whenever（不论什么/哪一个/哪里/谁/何时）比较状语从句： as （正如）as.as （和一样） not as/so . as （不如）than （比更）the+比较级+the+比较级（越越）条件状语从句：if （假设）unless （如果不） so long as （只要）on condition that （如果）方式状语从句：as （像那样地） just as （正像）as if （好像）as though （好像）二各种状语从句的简化方法：状语从句由when/while/as/once/whenever引导的时间状语从句当主句的
9、主语和 从句的主语一致 时,且谓语动词为 be,常省略从句的 主语和谓语be.祥解请 看状语 从句由if/unless引导的条件状语从句由 though/although/even though/even if 引导的让步状语从句由because引导的原因状语从句由wherever引导的地点状语从句1. 以after和before引导的状语从句的主语若与主句主语一致时，从句等于after/before+doing sth.作状语。例: After she sang, she left the rich mans house.= After singing, she left the rich
10、mans house.2. 以as soon as引导的状语从句的主语若与主句主语一致时，从句等于on+doing sth,作状语，此时的动词为 非延续性动词。例: Mary began to operate on the wounded soldiers as soon as he arrived at the village.= Mary began to operate on the wounded soldiers on arriving at the village.3. 时间状语从句和条件状语从句的主语和主句主语一致时，有时可简化为不定式作状语。例：She stopped when
11、 she saw her husband.= She stopped to see her husband.If you want to understand the farmers，you must go to the countryside.= To understand the farmers，you must go to the countryside.4. 结果状语从句和目的状语从句的主语与主句主语一致时，可以简化为不定式作状语；若两者主语不一致时， 则应简化为不定式的复合结构作状语。例: He was so tied that he couldnt go any further.
12、= He was too tied to go any further.I came here so that I could ask some questions.= I came here(in order) to ask some questions.5. 以 when， while 引导的时间状语从句和以 if 引导的条件状语从句的主语若与主句主语一致时，从句等于 when/while/if +doing sth作状语，表示谓语动作发生在该状语动作的进行过程之中。例： When he turned on the radio, he found it broken. = When tur
13、ning on the radio, he found it broken.While she was walking along the street，she was hit by a car. = While walking along the street，she was hit by a car.6. 原因状语从句的主语与主句主语一致时，可简化为分词短语作状语。例: Since l didnt know Chinese， I tried to speak to her in English. = Not knowing Chinese， I tried to speak to her
14、in English.注意： 形容词短语也可作表示原因的状语，来代替原因状语从句，放在句首、句末均可，但一般应加逗号。 例: As he was thirsty and eager to get a little rest， he went into the tea-house.= Thirsty and eager to get a little rest，he went into the tea-house.7. 在时间、原因、条件等状语从句中，若从句和主句主语不一致时，可简化为分词复合结构作状语。有时也 可简化为“with/without名词或代词十分词(短语)”形式作状语。例: Whe
15、n the film start appeared, the children got exited. = The film start appearing， the children got exited.If all the work is done, you can have a rest= With all the work done，you can have a restNothing can live if there is no air= Nothing can live without air8. 让步状语从句的主语与主句主语一致时，可简化为分词短语作状语；不一致时，常简化为with或in spite of 介词短语作状语。例： Although he faced his death, he didnt say anything before the enemy.= Facing the death，he didnt say anything before the enemy.Although there was danger，h
