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英语从句的类型与用法
个人理解，不喜勿喷。
一般来说，than 是介词，(用以引出比较的第二部分) 比; (比较数量、距离等) 多于，小于，少于; (表示一事紧跟另一事发生) 就;
She looks younger than before. 介词单独不做成分。than before 一起做比较状语。
要做也是和其他词一起成为短语做成分。如：China主语will move from谓语 its current industrial-agricultural ecomomy宾语 toward谓语动词一部分 one宾语with a sophisticated services sector定语 much faster than we might have expected. 比较方式状语从句。
209-07-0 比较状语从句详解
比较状语从句是主从复合句，所以它由两部分构成：主句和状语从句。主句和从句存在着比较关系。一般模式为：主句+连词+比较状语从句。常用连词或结构有：as；as …as, not as/ so … as；than；:the more … the more … ; just as …, so…; A is to B what /as X is to Y; no … more than; not A so much as B
1.比较
同级比较： as...as 引导的比较状语从句；as 引导的比较状语从句；not so/as...as "引导的比较状语从句；as many/much a引导的比较状语从句。
例如：She is as bad-tempered as her mother.
There are almost as many definitions of history as there are historians.有多少历史学家，就有多少历史学的定义。
That's not so/as simple as it sounds.那件事情不像听起来那么简单。
不同级比较： than引导的比较状语从句；more...than引导的比较状语从句；less...than引导的状语从句。
例如：You look younger than you are. 你看上去比你的实际年龄要年轻。
2.倍数：表达倍数也是一种比较。常用：是......倍，可以用N times as much as来表达;多......倍，可以用”more than/less than”来表达；是百分之几，则可以用N%来表达。
The house is three times as big as ours.
There are only half as many fisheries as there were 15 years ago. 如今的渔场数量仅是15年前的一半。
其他：the..., the...引导的比较状语从句；not …so much as引导比较状语从句；“not….any more than”比较状语从句；“no more ….than”引导的比较状语从句；no less than. 引导的状语从句；not any less than”引导的状语从句。
如：Mary is no more diligent than Tom.就意为Mary和Tom都不勤奋。
The more you study, the more knowledge you can get. 你学的知识越多，你的知识越丰富。
The great use of a school education is not so much to teach you things as to teach you the art of learning.学校教育的重大作用，与其说是交给你东西，不如说是交给你学习的艺术。
省略和替代：
比较状语从句中，若存在相同性质的比较对象，会出现表达的重复，所以会使用替代和省略。
例如：James enjoys the theater more than Susan does .(动词替代）
Contrast may make something appear more beautiful than it is when seen alone.（it is后省略了 beautiful）。
时间状语从句的用法总结
比较状语从句，通常由as，then引导，不修饰动词，而是修饰as，less，more等副词，或其他比较级的词，如taller，harder等。
比较状语从句常见结构
同级比较
as + adj/adv + as 和...一样
not as (so) + adj/adv + as 和... 不一样
倍数 + as + adj/adv + as 和...的几倍一样
as 连接的比较状语从句常常省去与主句相同的部分，只留下相比较的部分
若涉及数量或程度，还可以用：
as + much + 不可数名词 + as 或者
as + many + 复数名词 + as 的结构
不同级比较
adj/adv 比较级 + than 比....
the more ... the more... 越... 就越...
as 和 than连接的比较状语从句常常省去与主句相同的部分，只留下相比较的部分。
英语中的状语从句分为哪几类?
英语状语从句分8种：
1.时间状语从句（adverbial clauses of time）,多由连词引起。
（when,after,before,as,as soon as,as long as,since,whenever,once）
E.g. When we lived in town we often went to the theater.
It was a long time before I got to sleep again.
As the sun rose the fog dispersed(vt. 消散).
少数不由连词引起状语从句。
（now that,every time,each time,the moment,immediately,instantly,directly）
E.g. Directly he uttered(vt. 说出)these words, there eas a dead silence.
I had no sooner checked in the hotel than he arrived.
2.地点状语从句（adverbial clause of place）
(where,wherever,anywhere)
E.g. The church was built where there had once been a roman temple(n.寺庙).
Everywhere I go, I find the same thing.
3.方式状语从句（adverbial clause of manner）,一般由as，like，as if引起。
E.g. I am as you can image short of money. 正如你能想象的那样，我很缺钱。
I did as she asked.
Do it as he does.
I feel just like I did when I was a boy.
I remember the whole thing as if it happened yesterday.
He glanced about as if in search of something.
4.原因状语从句（adverbial clause of reason), 一般由because,as,since,in case,还有两个词有相同的意思（seeing,considering）
E.g. He was angry because we were late.
As the soup was very salty, we were thirsty afterwards.
He took a spoonful(n.满满的一勺) and tasted it in case it was hot.
Seeing that it is ten o’clock, we shall not wait for her any longer.
5.条件状语从句，一般由if，unless,supposing, providing,as long as, granted that引起。
E.g. We sat on the grass if it was fine.
If I could afford it, I would buy a boat.
If necessary, ring me at home.
Supposing he can’t come, who will do the work?
6.让步状语从句（adverbial clause of concession）,主要由although, though, even though, while,whereas。
E.g. Though we are poor, we are still happy.
Some praise him, whereas others condemn him.
Though not large, the room was well lit.
7.目的状语从句和结果状语从句（adverbial clause of purpose and adverbial clause of result),主要由so that,such that, in order that,otherwise,else.
E.g. Let’s take the front seats that we may see more clearly.
Give me back the money, otherwise I’ll ring the police.
Hurry up or else you’ll be late.(赶快，否则你就会迟到了。)
8.比较状语从句（adverbial clauses of comparison）,主要由than ,as 引起。
E.g. You sing better than I do.
I haven’t done as much as I should have liked.(我没做得像我希望的那样好。)
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