标题：状语从句
种类
1.时间状语从句
2.地点状语从句
3.原因状语从句
4.条件状语从句
5.目的状语从句
6.让步状语从句
7.比较状语从句
8.方式状语从句
9.结果状语从句
状语从句的时态特点
一般情况下，时间和条件状语从句的谓语动词一般用“一般现在时”表示“一般将来时”，用“现在完成时”表示“将来完成时”。例如： 
I will call you as soon as I arrive in Beijing. 我到北京就将给你打电话。（这是由as soon as引导的时间状语从句，从句中的谓语动词arrive是一般现在时，表示一般将来时，绝不可用will arrive） 
As soon as I have finished this work, I will have gone home. 我一完成此工作，就回家。（从句中的谓语动词用现在完成时have finished，表示将来完成时,绝不可用will have finished） 
If he comes back, please let me know.如果他回来了，请通知我。（从句中的谓语动词用comes back,表示一般将来时，绝不可用will come back）状语从句讲解和练习状语修饰动词、形容词、副词或整个句子。通常由副词、介词短语、动词不定式、分词和从句等担当。例如：
1. Naturally , our grandparents were pleased to get our phone call . (副词)
2. We worked hard , from sunrise to sunset . (介词状短语)
3. To help my disabled aunt , I spend an hour working in her house every day . (不定式)
4. Seen from a distance , the farmhouse looked deserted . (过去分词)
5. I know how to light a camp fire because I had done it before .（原因状语从句）
状语的位置比较灵活，可以位于句首、句末或句中。enough用作状语修饰形容词和副词时必须后置。
状语从句主要用来修饰主句或主句的谓语。一般可分为九大类，分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。尽管种类较多，但由于状语从句与汉语结构和用法相似，所以理解和掌握它并不难。状语从句的关键是要掌握引导不同状语从句的常用连接词和特殊的连接词即考点。现分别列举如下:1． 时间状语从句常用引导词：when, as, while, as soon as, before, after, since , till, until
特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than, hardly …when, scarcely … when
I didn’t realize how special my mother was until I became an adult.
While John was watching TV, his wife was cooking.
The children ran away from the orchard(果园), the moment they saw the guard.
No sooner had I arrived home than it began to rain.
Every time I listen to your advice, I get into trouble.2． 地点状语从句常用引导词：where
特殊引导词：wherever, anywhere, everywhere
Generally, air will be heavily polluted where there are factories.
Wherever you go, you should work hard.
地点状语从句一般由连接副词where, wherever等引导，已经形成了固定的句型，例如： 
句型1：Where+地点从句，（there）+主句。 
【注意】此句型通常译成“哪里……哪里就……”；主句在从句后面时，there可用可不用；如果主句在从句的前面时，一般都不用there。例如： 
Where there is no rain, farming is difficult or impossible.在没有雨水的地方，耕作是困难的，或根本不可能的。 
They were good persons. Where they went, there they were warmly welcomed. 他们都是好人。因此他们走到哪里都受到热烈欢迎。 
You should have put the book where you found it. 你本来应该把书放回原来的地方。 
Where the Communist Party of China goes, there the people are liberated.哪里有了中国共产党，哪里人民就得解放。 
句型2：anywhere/wherener+地点从句/主句。 
【注意】anywhere本身是个副词，可以引导从句，相当于连词，意思相似于wherever, anywhere引导的从句可位于主句之前，也可以位于主句之后。 而wherever本身就是个连词，表示“在何处，无论何处”。例如： 
Wherever the sea is , you will find seamen.有海就有海员。3． 原因状语从句常用引导词：because, since, as, for
特殊引导词：seeing that, now that, in that, considering that, given that.
My friends dislike me because I’m handsome and successful.
我的朋友不喜欢我，因为我又英俊又成功。 
Now that everybody has come, let’s begin our conference.
既然每个人都到了，让我们开始我们的会议吧。
The higher income tax is harmful in that it may discourage people from trying to earn more.
更高的收入税是有害的，因为它或许会阻碍人们努力赚钱。4． 目的状语从句常用引导词：so that, in order that
特殊引导词：lest, in case, for fear that，in the hope that, for the purpose that, to the end that
The boss asked the secretary to hurry up with the letters so that he could sign them.
老板要求秘书快写函件以便他能在上面签字。
The teacher raised his voice on purpose that the students in the back could hear more clearly.
为了让后面的学生听得更清楚，老师有意地提高了他的声音。5． 结果状语从句常用引导词：so … that, such … that,
特殊引导词：such that, to the degree that, to the extent that, to such a degree that,
He got up so early that he caught the first bus.
It’s such a good chance that we must not miss it.
To such a degree was he excited that he couldn’t sleep last night.6． 条件状语从句常用引导词：if, unless,
特殊引导词：as/so long as, only if, providing/provided that, supposing that, in case that, on condition that
We’ll start our project if the president agrees.
You will certainly succeed so long as you keep on trying.
Provided that there is no opposition, we shall hold the meeting here.7． 让步状语从句常用引导词：though, although, even if, even though
特殊引导词： as(用在让步状语从句中必须要倒装)，while ( 一般用在句首 )，no matter …， in spite of the fact that, whatever, whoever, wherever, whenever, however, whichever
Much as I respect him, I can’t agree to his proposal.
尽管我很尊敬他， 我却不同意他的建议。
The old man always enjoys swimming even though the weather is rough.
No matter how hard he tried, she could not change her mind.
He won’t listen whatever you may say.8． 比较状语从句常用引导词：as(同级比较), than(不同程度的比较)
特殊引导词：the more … the more … ; just as …， so…; A to B is what/as X is to Y; no … more than; not so much A as B
She is as bad-tempered as her mother.
The house is three times as big as ours.
The more you exercise, the healthier you will be.
Food to men is what oil is to machine. 食物之于人，犹如油之于机器。9． 方式状语从句常用引导词：as, as if, how
特殊引导词：the way
When in Rome, do as the Roman do.
She behaved as if she were the boss.
Sometimes we teach our children the way our parents have taught us.10. 状语从句的简化状语从句的省略
状语从句同时具备下列两个条件:①主句和从句的主语一致，或从句主语为it；②从句主要动词是be的某种形式。从句中的主语和be动词常可省略。例如：
When ( the museum is ) completed , the museum will be open to the public next year .
He’ll go to the seaside for his holiday if (it is ) possible.
另外，比较状语从句经常省略。例如：
I’m taller than he (is tall ).
The higher the temperature (is), the greater the pressure (is ).
就状语从句而言,有时为了使语言言简意赅,常常将状语从句进行"简化"。状语从句的"简化"现象在口语中较为普遍,而且在高考中的复现率也较高。因此,有必要对其进行全面、透彻的了解。
状语从句的"简化"现象常存在于以下五种状语从句中:①由if, unless等引导的条件状语从句;②由although, though, even if / though等引导的让步状语从句;③由when, while, as, before, after, until / till等引导的时间状语从句;④由as, as if等引导的方式状语从句;⑤由as, than等引导的比较状语从句。下面针对这五种情形作一归纳。
(1)当状语从句的主语是it,且谓语动词是be时,it和be要完全简化掉。例如:
If (it is) possible, he will help you out of the difficulty.如果可能的话,他会帮你摆脱困境。
You must attend the meeting unless (it is) inconvenient to you.除非情况对你来说不方便,否则你必须出席这次会议。
(2)当状语从句的主语和主句的主语一致时,从句可以将主语和be动词简化掉。常用于以下几种情形:a.连词+形容词As (he was) young, he learned how to ride a bike.他小时候就学会了骑自行车。
Whenever (she is) free, she often goes shopping.她有空就去逛商店。
Work hard when (you are) young, or you'll regret.少壮不努力,老大徒伤悲。b.连词+名词While (he was) a young boy, he was always ready to help others.他在孩子时代就乐于助人。
Although (he was) a farmer, now he is a famous director.尽管他曾是个农民,但现在他是位著名的导演了。c.连词+现在分词As (she was) walking along the river bank, she was singing a pop song.她沿着河堤边走边唱着流行歌曲。
Although (he is) doing his best in maths these days, he has still got no good marks.尽管近来他一直在学数学,但他仍然没有取得好成绩。d.连词+过去分词He won't go there with us unless (he is) invited.除非受到邀请,否则他不会和我们一道去那里。
The concert was a great success than (it was) expected.这场音乐会出乎意料地取得了巨大成功。e.连词+不定式He stood up as if (he were) to say something.当时他站起来好像要说什么。
He wouldn't solve the problem even if (he were) to take charge.即使他来负责,他也解决不了这个问题。f.连词+介词短语She looked anxious as though (she was) in trouble.她看上去很焦急,好像遇到了麻烦。
He had mastered the English language before (he was) in the USA.他到美国之前就懂英语了。
注意:当从句主语和主句主语不一致时,从句部分要么用完全形式,要么用独立主格结构来表达。例如:
When the meeting was over, all the people went out of the meeting-room.当会议结束时,人们都走出了会议室。(=The meeting over,
时间
概念：在复合句中，由时间状语从句表示主句动作发生的时间。(在复合句中，要注意主句和从句的时态大多都要保持一致。）要点:时间状语从句，由以下连词引导：
when while as after before as soon as since till /until by the time 在时间状语从句中，要注意时态一致。一般情况下主句是将来时的时候，从句主要用一般现在时。1.when在...的时候Mozart started writing music when he was four years old.
(在)莫扎特4岁的时候，开始写音乐作品。2.while在...期间He visited a lot of places while he was traveling.
他在旅行期间参观了许多地方。3.as在...的同时；一边...一边...We alwalys sing as we walk.
我们总是一边走一边唱。
I'll let him know as soon as she comes.
她一来，我就会让他知道。4.after在...之后He left the classroom after he had finished his homework .
他做完作业之后就离开教室。5.before 在...之前Mr. Brown had worked in a bank for a year before he came here.
布朗先生来这里之前已经在一家银行里工作一年了。6.as soon as 一。。。就。。。We began to work as soon as we got there.
我们一到那就开始工作。
I will write to you as soon as I get home.
我一到家就给你写信。7.since 自。。。以来 到现在表示自过去的一个起始时间点到目前(说话时间)为止的一段持续时间。主句一般用现在完成时，从句用一般过去时。还可以用作介词，本句从句还可以用短语：since three years ago(从三年前至今)表示。
Mr Green has taught in that school since he came to China three years ago.
自格林先生来中国以来，他就在这所学校教书。8 till /until直到。。。都可以作连词，连接时间状语，也可以作介词，与其它词构成介词短语，在句中作状语。（强调将一般用until）
They walked till /until it was dark.
他们一直走到天黑。
Xiao Ming didn’t leave home till / until his father came back.
小明直到他爸爸回来才离开家。9. by the time 到。。。为止(所在句子的主句应用完成时)
By the time he gets there , his father has already gone.
他到家的时候，他爸爸已经走了。
By the time I got to school, the class had already began.
我到校时，已经开始上课了。
注意事项
1.由when, while, as引导的时间状语从句例如： 
When you think you know nothing, then you begin to know something.当你以为自己一无所知的时候，你就是在开始知道一些事物了。 
When truth is buried under the ground it grows, it chokes, it gathers such an explosive force that on the day it bursts out , it blows up everything with it.当真理被埋在地下的时候，它在生长，它感到压抑，它蓄存着一种爆炸性力量，一旦冒出，它就会炸破一切！ 
Strike while the iron is hot. 趁热打铁。 
Will you watch my clothes while I have a swim. 我游泳的时候，请你照看一下我的衣服。 
You can feel the air moving as your hand pushes through it. 当你的手在空气中挥动的时候，你就能感觉到空气在流动。 
Our headmaster laughed as she spoke.我们的校长一边谈一边笑。when, while和as的区别when引导的从句的谓语动词可以是延续性的动词，又可以是瞬间动词。并且when有时表示“就在那时”。
例如： 
When she came in, I stopped eating.她进来时，我停止吃饭。(瞬间动词) 
When I lived in the countryside, I used to carry some water for him.当我住在农村时，我常常为他担水。（延续性的动词） 
We were about to leave when he came in.我们就要离开，就在那时他进来了。(瞬间动词) 
While引导的从句的谓语动词必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。并且while有时还可以表示对比。例如： 
While my wife was reading the newspaper, I was watching TV. (was reading是延续性的动词，was reading和was watching同时发生) 
I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。（对比） 
As表示“一边……一边”，as引导的动作是延续性的动作，一般用于主句和从句动作同时发生；as也可以强调“一先一后。例如： 
We always sing as we walk.我们总是边走边唱。（as表示“一边……一边”） 
As we was going out, it began to snow.当我们出门时，开始下雪了。（as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）as when while的辨析as when while都表示主、从句动作同时发生，三者差异如下：
表示“一边。。。一边"的意思
as 强调两个动作同时进行，并表示对比时 
用于发生时间较短时
when 
1、还可以表示从句动词的动作在主句动词的动作"之前 "或"之后"发生。
2、when=and then; at that moment (正在那个时候)
while 1、用于时间较长时
2、 强调两个动作同时进行，并表示对比时
有时这三个连词可以互换，有时不可以。
It was raining hard when (as) I got there.
我到那里时，正在下大雨。 ( 动作同时发生，when可换为as, 但不能换为while，因为get是点动词.)
When I had read the article, he called me.
我看完这篇文章之后，她给我打了电话。( 从句动作发生在主句之前，注意时态表达，只能用when )
When I got to the cinema, the film had begun.
(当)我到了电影院时，电影已经开演了。(从句的动作发生在主句之后，只能用when,并要注意时态)
He was about to leave, when the telephone rang.
他正要离开，忽然电话响了。( 此时不能放在句首。主句动词一般表达 “正在” “即将”.
while, as不能代替 
She thought I was talking about her daughter, while, in fact, I was talking about my daughter.
他以为我在谈她女儿，然而，实际上在谈论我女儿。(表转折，对比，when, as都不能代替它) 
While the alien was buying a souvenir, the girl called the police.
外星人买纪念品时，那女孩给警察打了电话。(表示主句，从句的动作同时发生，while后引导的状语从句的动词必须是延续动词不能是点动词，因为它表示较长时间)
Mother was worried because little Alice was ill, especially as (when/ while) father was away.
妈妈担心，因为小爱丽丝病了，特别是他父亲不在家的时候。(此时as ,when, while可通用)2.由before和after引导的时间状语从句before的句型：
It is/was (not) +时间+before+从句 用了多长时间......
注意before引导的从句不再用否定式的谓语，并且当before引导的从句位于主句之后，有时译成“就，才”。还要注意主句和从句之间的时间关系。当主句用将来时，从句总是用现在时；如果before引导的从句谓语用的是过去时，则主句动词多用过去完成时，这样以便体现动作发生的先后。After表示主句动作发生在从句动作之后。主句和从句的动作的时间关系正好与before引导的从句相反。例如： 
It will be four days before they come back. 他们要过四天才能回来。 
Einstein almost knocked me down before he saw me.爱因斯坦几乎把我撞倒才看到我。 
My father had left for Canada just before the letter arrived.我父亲恰好在信到之前去加拿大了。 
They had not been married four months before they were divorced. 他们结婚还不到四个月就离婚了。 
After you think it over, please let me know what you decide.你仔细考虑过以后，告诉我你是怎样决定的。 
After we had finished the work, we went home.完成工作之后，我们回家了。（从句用过去完成时，主句用一般过去时）3.由till或until引导的时间状语从句till和until一般情况下两者可以互换，但是在强调句型中多用until。并且要注意的是：如果主句中的谓语动词是瞬时动词时，必须用否定形式；如果主句中的谓语动词是延续性动词时，用肯定或否定形式都可以，但表达的意思不同。例如： 
I didn't go to bed until（till） my father came back.直到我父亲回来我才上床睡觉。 
It was not until the meeting was over that he began to teach me English.直到散会之后他才开始教我英语。 
I worked until he came back.我工作到他回来为止。 
I didn't work until he came back.他回来我这才开始工作。 
Please wait until I arrived.在我到达之前请等我。4.由since引导的时间状语从句since引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。但在It is +时间+since从句的句型中，主句多用一般现在时。例如： 
I have been in Beijing since you left. 自从你离开以来，我一直在北京了。 
Where have you been since I last saw you? 自上次我和你见面以后，你到哪里去了？ 
It is four years since my sister lived in Beijing. 我妹妹不在北京住有四年了。 
It is five months since our boss was in Beijing.我们老板离开北京有五个月了。 5.by the time的用法by the time 的意思是“截止到......（时间）为止”，后面接时间状语从句。例如：
The other students had finished cleaning by the time I arrived.截止到我到来之前，其他学生已经打扫完卫生了。
They had stopped serving meals by the time we got to the restaurant.截止到我们到达餐馆时，他们已经停止买饭了。知识扩展1. It is since从。。。知识扩展来多长时间了(因为since +从句或名词，表示一段时间)
It is five years since we met last time.从我们上次见面已经五年了。
2. It is +before…(。。。才)
It was a long time before I went to sleep again.
过了很长时间我才睡着。
It was an hour before(=until) the police arrived.
过了一个小时，警察才来。
5.由as soon as, immediately, directly, instantly, the moment, the instant, the minute, ]等引导的时间状语从句b]　这些连词都表示“一……就……”。
例如： 
I will go there directly I have finished my breakfast. 吃完早饭，我立即到那里去。 
The moment I heard the news, I hastened to the spot.我一听到消息，马上赶到了出事地点。 
As soon as I reach Canada, I will ring you up. 我一到加拿大，就给你来电话。 
【注意】hardly(scarcely, rarely)…when / before, no sooner…than相当于as soon as之意。主句用过去完成时，从句用一般过去时。当hardly, scarcely, rarely和no sooner位于句首时，主句应用倒装语序。例如： 
He had no sooner arrived home than he was asked to start on another journey. 他刚到家，就被邀请开始另一旅程。 
No sooner had the sun shown itself above the horizon than he got out of bed to commence work.太阳刚从地平线上升起，他就起床劳动去了。 
Hardly had I sat down when he stepped in.我刚坐下，他就进来了。 
He had hardly fallen asleep when he felt a soft touch on his shoulder.他刚要入睡就感到肩膀上被轻轻一触。6.由by the time引导的时间状语从句注意时态的变化：在一般情况下，如果从句的谓语动词用一般过去时，主句的谓语动词用过去完成时；如果从句的谓语动词用一般现在时，主句的谓语动词用将来完成时。例如： 
By the time you came back, I had finished this book.到你回来时，我已经写完这本书了。 
By the time you come here tomorrow, I will have finished this work. 你明天来这儿的时候，我将已经完成此工作了。
7.由each time, every time和whenever]引导的时间状语从句b]　例如： 
Each time he came to Harbin, he would call on me. 他每次来哈尔滨，总是来看我。 
Whenever that man says“To tell the truth”, I suspect that he's about to tell a lie.每当那个人说“说实在话”的时候，我猜想他就要说谎了。 
You grow younger every time I see you. 每次遇到你，见你更年轻了。
8.由as long as和so long as]引导的时间状语从句。b]这两个连词表示“有多久……就多久”，通常译为“只要”　例如： 
You can go where you like as long as you get back before dark. 你可以随意到哪里去，只要在天黑以前回来就行。 
I will fight against these conditions as long as there is a breath in my body! 只要我一息尚存，我就要反对这种境况。9.when和while的区别when 和 while 都可表示“当.....时....”“这时候.....”when后及短暂性动词（land，come in，meet，leave 等），while后及延续性动词（shop，visit，read，sleep 等）
when 后及一般过去式。eg：The girl was shopping when she saw the alien.
What was Charlotte doing when the alien took off ?
while 后及过去进行时。eg：While the alien was buying a souvenir , the boy called the police.
While the alien was reading the book , the boy called the TV station[1].
地点
概念：地点状语从句 (adverbial clause of place) 
地点状语从句一般由连接副词where, wherever等引导，已经形成了固定的句型，要点:由连词where和复合关系词wherever (=no matter where )引导.
例如：句型1：Where+地点从句，（there）+主句。
【注意】此句型通常译成“哪里……哪里就……”；主句在从句后面时，there可用可不用；如果主句在从句的前面时，一般都不用there。例如： 
Where there is no rain, farming is difficult or impossible.在没有雨水的地方，耕作是困难的，或根本不可能的。 
They were good persons. Where they went, there they were warmly welcomed. 他们都是好人。因此他们走到哪里都受到热烈欢迎。 
You should have put the book where you found it. 你本来应该把书放回原来的地方。 
Where the Communist Party of China goes, there the people are liberated.哪里有了中国共产党，哪里人民得解放。句型2：Anywhere/ wherever+地点从句，+主句。
【注意】anywhere本身是个副词，但是，常可以引导从句，相当于连词，意思相似于wherever, anywhere引导的从句可位于主句之前，也可以位于主句之后。 而wherever本身就是个连词，表示“在何处，无论何处”。例如： 
Wherever the sea is , you will find seamen.有海就有海员。知识扩展1.Where there is a will , there is a way.
有志者事竟成。(谚语)
1.It will be mixed school where not all the children are disabled.
他将是一所混合式学校，那里的儿童并不都是残疾。(在限定性定语从句中对限先行词起限定作用。)
2.Wherever you go , I go too.
无论你到什么地方，我都去。(wherever=no matter where)无论何处，多用于句首。
3.Wherever there is smoke , there is fire.
无风不起浪。(谚语)
4. While she was wondering where to go , she met a policeman. 
疑问副词where后跟不定式,构成不定式短语.
条件
要点： 条件状语从句由连词if, unless (=if not) 引导。
1.If it doesn’t rain tomorrow, we will go hiking.
如果明天不下雨, 我们就去远足.
2.You will get good grades if you study hard.
如果你努力学习,就会取得好成绩.
3.I will go to the party unless he goes there too.
我会去参加聚会的, 除非他也去.(如果他不去,我就去.)
4.You will be late unless you leave immediately.
如果你不马上走,你将会迟到的.(=If you don’t leave immediately, you will be late.)
难点提示：用条件状语从句时要注意时态的正确使用,当主句是将来时的时候,从句要用一般现在时.
He will not leave if it isn’t fine tomorrow.
一般将来时， 一般现在时
They are going to have a picnic if it doesn’t rain next week.
一般将来时, 一般现在时
原因
要点: 由连词because, since, as引导, 也可由for, now that 等词引导
1.I didn’t go to school yesterday because I was ill.
我昨天没去上学，因为我生病了。
2. Since everybody is here, let’s begin our meeting.
既然大家都来了, 让我们开始开会吧.
3. As you are in poor health, you should not stay up late.
既然你身体不好, 你就不该熬夜.
4.I asked her to stay to tea for I had somethingto tell her.
我请她留下来喝茶,因为我有事要告诉她.
.难点——because , since , as , for,辨析
1）　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。 
I didn’t go because I was afraid. 
Since /As the weather is so bad, we have to delay our journey. 
2）　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。 
He is absent today ,because / for he is ill. 
He must be ill for he is absent today.
3) as和for的区别：
通常情况下，as引导的从句在主句前，for引导的从句在主句后。例：
As the weather is cold, I stay at home.（同义句）
I stay at home for the weather is cold.
目的
要点： 目的状语从句由连词that, so that, so…that , in order that 引导。
1.so that 以至, 以便
I’ll run slowly so that you can catch up with me. (目的)
我将慢慢跑以至你能赶上我。
I opened the window so that fresh air might come in. (目的)
我把窗户打开以使新鲜空气可以进来。
2.in order that=so that:为了
We shall let you know the details soon in order that you can/may make your arrangements.
不久我们将会让你知道详情,以便你们能够做出安排。(目的)
3.despite= in spite of
结果
要点：结果状语从句由连词( so )that, so…that, such…that, so much/many…that引导。
1.so…that 如此…以至于
The scientist’s report was so instructive that we were all very excited.
科学家的报告很有启发性，我们感到很兴奋。
He always studied so hard that he made great progress.
他总是那么努力，结果他取得了很大的进步。
2. such…that 如此。。。以至
It’s such nice weather that all of us want to go to the park.
天气是如此的好，我们大家都想去公园玩。
3.比较：so和 such 
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(这四个形容词表多或表少时)连用，形成固定搭配。 
so foolish　such a fool　
so nice a flower　such a nice flower　
so many / few flowers　such nice flowers　
so much / little money. such rapid progress　
so many people　such a lot of people　
（ so many 已成固定搭配，a lot of 虽相当于 many，但 a lot of 为名词性的，只能用such搭配。） 
so…that与such…that之间的转换既为 so与such之间的转换。 
The boy is so young that he can’t go to school. 
He is such a young boy that he can’t go to school 
难点
+形容词或副词
+形+a(an)+单数可数名词
so +many 或few+复数可数名词 +that
+much或 little+不可数名词 
so that ,such…that 都可以in order that两者皆可引导目的状语从句和结果状语从句，
当他们引导目的状语从句时，从句的谓语里常常有can, could, may, might, will, would等次。 
so +adj或adv.+ that， such +n.+ that 以上两种句型都表示结果,其中so为副词,后接形容词，副词原型，当可数名词前有many, few；不可数名词前有much, little修饰时，应采用句型：so many (few, much, little )+n. 。 such为形容词, 后只能接名词。这名词既可以地可数的，也可以是不可数的。如果这名词是可数,单数,则必须在名词前加冠词a(an). 常见的形式是:such a (beautiful)garden, such(nice)people. 
1。I’ve had so many falls that I’m black and blue all over.
我跌了很多跤，浑身数摔得清一块紫一块.
2。there are so few notebooks that I can’t give you any.
笔记本太少了,我一本也给不了你.
3。It is such nice weather that I’d like to take a walk.
天气是如此之好,以至于我想去散散步. 
4。Mike is so honest a man that we all believe him.
麦克是如此诚实的一个人,以至于大家都相信他
(=Mike is such an honest man that we all believe him.) 
5。The weather is so nice that I’d like to take a walk. 
天气是如此之好,以至于我想去散散步.
让步
要点: 表示让步的状语从句由连词 though, although引导.
难点：
lthough, although当虽然讲, 都不能和but连用. Although,(though)…but的格式是不对的.但是他们都可以同yet (still) 连用. 所以though (although)…yet(still)的格式是正确的.
Wrong: Although he is rich but he is not happy.
Right : Although he is rich, yet he is not happy.
虽然他很富有, 然而他并不快乐.
Wrong: Although we have grown up, our parents treat us as children.
Right : Although we have grown up, our parents still treat us as children.
尽管我们已经长大了,可是我们的父母仍把我们看作小孩.
although, though 辨析
although 不能though 那样用作副词, 放在句末表示强调时要用even though.
1。He is looking fit, though.
但是,他看上去很健康. 考点
2。Even though I didn’t understand a word, I kept smiling.
尽管我一个字也不懂，我还是一直微笑着。
3。He is quite experienced, he is young, though.
尽管他很年轻，他很有经验。
典型例题
1） ___she is young, she knows quite a lot.　
A. When　B. However　C. Although　D. Unless 
答案：C。意为虽然她很年轻，却知道许多。 
2)　as, though 引导的倒装句
as / though引导的让步从句必须表语或状语提前（形容词、副词、分词、实义动词提前）。 
Child as /though he was, he knew what was the right thing to do. 
= Though he was a small child, he knew what was the right thing to do. 
注意：
a.　句首名词不能带任何冠词。 
b.　句首是实义动词，其他助动词放在主语后。如果实义动词有宾语和状语，随实义动词一起放在主语之前。 
Try hard as he will, he never seems able to do the work satisfactorily. 
= Though he tries hard, he never seems… 
虽然他尽了努力，但他的工作总做的不尽人意。 
3)　ever if, even though.　即使 
We’ll make a trip even though the weather is bad. 
4) whether…or-　不管……都 
Whether you believe it or not, it is true. 
5)　"no matter +疑问词" 或"疑问词+后缀ever" 
No matter what happened, he would not mind. 
Whatever happened, he would not mind. 
替换：no matter what = whatever 
no matter who = whoever 
no matter when = whenever 
no matter where = wherever 
no matter which = whichever 
no matter how = however 
注意：no matter 不能引导主语从句和宾语从句。 
（错）No matter what you say is of no use now. 
（对）Whatever you say is of no use now. 
你现在说什么也没用了。(Whatever you say是主语从句) 
（错）Prisoners have to eat no matter what they’re given, 
（对）Prisoners have to eat whatever they’re given.　囚犯们只能给什么吃什么。
比较
要点：比较状语从句主要运用于形容词和副词的原级，比较级及最高级的句子之中。原级1. as…as 和。。。一样
Jack is as tall as Bob.
捷克和汤姆一样高。
2. not so(as)…as …和不一样
She is not so(as)outgoing as her sister.
她不如她姐姐外向。比较级more…than (更)
This book is more instructive than that one.
这本书比那本书有教育意义。最高级1.The most…in/of
This book is the most interesting of the three.
这本书是三本中最有趣的。 
2. the + 形容词+est…of/in
This road is the busiest street in our city. 
这条路是我们城市最繁忙的街道。知识扩展no more than只不过(嫌少的意思)
1。I have no more than two pens.
我只有两支笔。
2。It’s no more than a mile to the shops.
去商店不过一英里。
not more than不如。。。；(前者不如后者)
1。Jack is not more diligent than John.
捷克不如约翰勤奋。
2。one of the + 名词(复数)….之一(用于最高级)
Han Mei is one of the best students in our school. 
韩梅是我们学校最好的学生之一。
方式
方式状语从句通常由as, (just) as…so…, as if, as though引导。 
1） as, (just) as…so…引导的方式状语从句通常位于主句后，但在(just) as…so…结构中位于句首，这时as从句带有比喻的含义，意思是"正如…"，"就像"，多用于正式文体，例如： 
1。Always do to the others as you would be done by. 
你希望人家怎样待你，你就要怎样待人。
2。As water is to fish, so air is to man. 
我们离不开空气，犹如鱼儿离不开水。
3。Just as we sweep our rooms, so we should sweep backward ideas from our minds. 
正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。 
2） as if, as though 
两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反，有时也用陈述语气，表示所说情况是事实或实现的可能性较大。汉译常作"仿佛……似的"，"好像……似的"，例如： 
1。They completely ignore these facts as if (as though) they never existed. 
他们完全忽略了这些事实，就仿佛它不存在似的。（与事实相反，谓语用虚拟语气。） 
2。He looks as if (as though) he had been hit by lightning. 
他那样子就像被雷击了似的。（与事实相反，谓语用虚拟语气。） 
3。It looks as if the weather may pick up very soon. 
看来天气很快就会好起来。（实现的可能性较大，谓语用陈述语气。） 
说明：as if / as though也可以引导一个分词短语、不定式短语或无动词短语，例如： 
1。He stared at me as if seeing me for first time. 
他目不转睛地看着我，就像第一次看见我似的。 
2。He cleared his throat as if to say something. 
他清了清嗓子，像要说什么似的。 
3。The waves dashed on the rocks as if in anger. 
波涛冲击着岩石，好像很愤怒。
运用
写作中能合理、正确地使用状语从句，不但能地道的表达英文习惯，而且还能使文体结构更加严谨、美观。例如下文：
My hobby
The hobby I enjoy most is fishing.
I started fishing (1)when I was five years old. I’ll never forget the day (2)when my father first took me fishing with him. On that day, I was holding a fishing rod (3)when a fish suddenly started pulling on the line. (4)I was so shocked that I fell into the water. But experience didn’t put me off and I have been fishing ever since.
Now I still go fishing with my father. And we often go out on Sundays and spend the whole day fishing in the river.
(1)是由when引导的时间状语从句，这类从句的使用频率很高。
(2)句是由I’ll never forget the day .及when my father first took me fishing with him.两句组成。When在从句中做时间状语。
(3)句也是由when 引导的时间状语从句。When 常与suddenly 连用，主句常用过去进行是。译为 “正在……, 忽然……”.
(4)是以 so…that… (太…..以至于……)引导的结果状语从句.
（5）the...the...
e.g.
The more you listen to English,the easier it becomes. The harder you work,the greater progress you will make. The more pictures I take,the more skilled I　become.
高考考察
【专题要点】状语从句考点概览：1.when， while， as引导时间状语从句的区别;2.名词词组the minute， the moment， the first time， each time， any time等用作连词，引导时间状语;3.before，和since引导时间状语从句的用法以及常见的几个句型;4.till和until的用法;5.although， though， as以及even if， even though引导让步状语从句的用法;6.结果状语从句中“so ----that”与“such---that”的区别;7.条件状语从句unless， providing/provided， suppose/supposing等引导词的用法;8.“疑问词+ever”和“no matter+疑问词”引导从句的用法 
【考纲要求】考纲要求在复习状语从句中掌握如下几点：1.全面掌握状语从句的九大类别;2.根据历年高考试题，对状语从句的考点要进行全面的归纳，在九大类别中的考查热点中，重点把握在引导时间、地点、条件、让步、比较、原因状语从句的连词运用上;3.熟练运用出现频率较高让步状语从句和原因状语从句;4.做好易混词的辨析如：as， when， while等，时间状语从句因为连接词容易出现在一些常用结构里也经常出现;5. 掌握状语从句中的时态、语态、语气、省略;6.与其它从句、句型结合起来分析、辨析