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1、种类状语从句一分类：连接词when/whenever/while/as/before/after/instantly /until/till/by the time/as soon as/hardlywhen/no soonerthan/the moment/the minute/immediately有一些表示时间的名词短语也可用来引导时间状语从注意区别：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时间状语句：the minute, the moment, every time, the first time 例：The moment he
2、reached the country, he started his search. 他一到达这个国家，就开始他的探寻工作。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。地点状语原因状语有一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where/whereverBecause/as/since/now that/fortill/until 和 nottil
3、l/until：until 可用于句首，而 till 通常不用于句首。where，表示某一个；wherever，表示任何一个。because 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一定要是现在发生的，since 可以是现在，也可以是过去和现在。条件状语
4、if/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。目的状语结果状语比较状语方式状语让步(so) that,/in order that/for fear that/in case/lestsothat, suchthatThan/not so/asas/the morethe moreas if, as though, as, (just)as-so，Though/although/even if/even though/ as/, no matt
5、er what/who/which/how/when，whatever/whoeverso that 和 in order that 后常接 may, should, could, would 等情态 动词其规律由 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 可与表示数量的形容词 many, few, much, little 连用，形成固定 搭配。Your watch is not the same as his.(the same as 结构) as if 和 as though 引导的从句一般用虚拟语气。a
6、s 在让步状语从句中常用倒装形式；although 和 though 用正状语/whichever/however/whenever ，whether-or-（不管- 常语序，可和 yet 连用，但不可和 but 连用 都）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) nottill/until （直到才） no soonerthan(刚就) 地点状语从句： where (在那里)
7、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 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） eve
8、n though/if（即使）no matter+what/which/where/who/when =whatever/whichever/wherever/whoever/whenever（不论什么/哪一个/哪里/谁/何时）比较状语从句： as （正如） asas（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
9、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 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当主句的主语和从 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.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
10、，she left the rich mans house = After singing，she left the rich 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 vil
11、lage3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 she saw her husband = She stopped to see her husbandIf you want to understand the farmers， you must go to the countryside= To understand the farmers，you must go to the countryside4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
12、合结构作状语。例：He was so tired that he couldnt go any further= He was too tired to go any furtherI came here so that I could ask some questions= I came here(in order) to ask some questions5 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 h
13、e turned on the radio，he found it broken = When turning 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 car6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
14、knowing Chinese，I tried to speak to her 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-house7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/
15、without 名词或代词十分词(短语)”形式作状语。例：When the film start appeared, the children got exited = The film start appearing ，the children got exitedIf all the work is done, you can have a rest= With all the work done，you can have a rest Nothing can live if there is no air= Nothing can live without air8让步状语从句的主语与主
16、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，he rushed out to carry the boy to safety= In spite of danger，he rushed out to carry the boy
17、to safety三表示一就的结构hardly/scarcelywhen/before, no soonerthan 和 as soon as 都可以表示一就的意思， 例：I had hardly / scarcely got home when it began to rain.I had no sooner got home than it began to rain.As soon as I got home, it began to rain.注意：如果 hardly, scarcely 或 no sooner 置于句首，句子必须用倒装结构：Hardly / Scarcely had
18、I got home when it began to rain.No sooner had I got home than it began to rain.四As 引导的让步状语从句的倒装：1形容词+as+主语+系动词：例：Tired as he is, he offers to help me. 尽管他已经很累了，他还是主动提出帮助我。2过去分词+as+主语+系动词：例：Well-known as the book is, the author is not satisfied and prepared to revise it.尽管这本书写得很好,作者还是不满意并打算修改它。3名词+as+主语+系动词：例：Student as he is, he does not study hard. 他虽然是个学生，但却不努力学习。4副词+as+主语+谓语部分：例：Much as I admire his courage, I dont think he acted wisely.我虽然钦佩他的勇气，但我认为他这样做是不明智的。5动词原形+as+主语+谓语的剩余部分：例：Try as you will， you wont be able to persuade him. 不管你怎么努力，你都说服不了他。