状语从句
一．分类：
种类 | 连接词 | 注意区别： |
朴素的拼音时间 状语 | when/whenever/while/as/before/after/instantly /until/till/by the time/as soon as/hardly…when /no sooner…than/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句：the minute, the moment, every time, the first time 例：The moment he reached the country, he started his arch. 他一到达这个国家，就开始他的探寻工作。 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 | as和when、while： 消毒制度? 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。 till/until和not…till/until： until可用于句首，而till通常不用于句首。 |
地点 状语 | where | |
| | … |
| | 为什么读研 |
| | |
| | |
] | | the same as结构) |
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 | { |
| | |
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/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） 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）
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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 | 洗衣机哪个好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. 德国元帅 |
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becau引导的原因状语从句 |
由wherever引导的地点状语从句 |
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1．以after和before引导的状语从句的主语若与主句主语一致时，糍粑怎么做好吃从句等于after/before+doing sth.作状语。
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例：After she sang，she left the rich man's hou． = After singing，she left the rich man's hou．
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 she saw her husband． = She stopped to e her husband．
If you want to understand the farmers，you must go to the countryside．
芸豆的功效与作用 = 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 tired that he couldn't go any further．= He was too tired 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 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 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 didn't know Chine，I tried to speak to her in English．= Not knowing Chine，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-hou．
= Thirsty and eager to get a little rest，he went into the tea-hou．
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：When the film start appeared, the children got exited．= The film start appearing，th
e children got exited．
If 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 air．
8．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 didn't say anything before the enemy．
= Facing the death，he didn't 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 to safety．
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孕妇能吃什么海鲜
三．表示"一…就…"的结构
hardly/scarcely…when/before, no sooner…than 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 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：
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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。
