定从中AS用法

Question

如题所述

Answer 1

呵呵 希望对你有所帮助 祝楼主进步哈

一.as在定语从句中做关系代词,在从句中充当主语,宾语,或表语,as做表语习惯省略be动词.
as在限制性定语从句中
1.such+名词+as从句   such用来修饰名词
I don't like such a man as talks big.我不喜欢吹牛的人.
Such house as she could find was expensive .凡是他能找到的房子都很贵.
注意区别下面两句话
This is such an interesting book as everyone likes.定语从句 as做宾语 这是一本每个人都喜欢的书.
This is such an interesting book that everyone likes it. 结果状语从句 这是一本有趣的书以至于每个人都喜欢.(such 修饰名词,so修饰形容词或副词)
such+名词+as 表列举
I like such animals as dogs ,cats.
such +n+as to do sth
I am not such a fool to believe her .
such as to do sth
Met with disappointments such as to drive me mad .
2.such as从句  such是代词在主句中充当主语,宾语,表语
Such as you see is our house.
such as 表列举
I know three languages, such as Chinese,English.
such+n+as to =such+n+(that)从句
as such 意思是"本身"
Money as such will seldom bring happiness.
the same +名词 +as从句
I have the same book as he is reading.
定语从句 as做宾语 我有一本和他正在读的一样的一本书.(两本书)
I have the same book that he is reading.
定语从句 that做宾语 我得到了他正在读的那本书.(同一本书)
as(so)+adj+a+名词+as从句  只能用名词单数
He is as clever a child as I ever saw. 定语从句 as做宾语他是我曾经见过的最聪明的孩子.
so +形容词+as to do sth =so...that...   (so修饰形容词或副词) 
I get up so early to catch the first bus.
so as to do sth =in order to sth
I worked hard so as to finish it before weekend.
as在非限制性定语从句中
修饰主句,对主句所陈述的事实加以概括,补充,说明等,此时as和which一样.
区别:(1)as位置灵活,可在主句前,可在主句后,which只能在主句后.
     (2)不是修饰主句,当前面有先行词时,不能用as,只能用which.例:The elephant is not like a snake,which has no legs.
更多例子:
as 做主语
as is well known (to us)
as was  mentioned before
as could be expected
as could be judged from her eyes
as may be seen from the book
as is recounted in his stories
as everyone could do
as often happens
as will be shown in fig.3
as has been pointed out
as has been explained
as is often the case
as (is) usual
He listed the names as follows (follows永远是单数)
as做宾语
as we all can see
as we all know
as it is

Answer 2

关系代词as用法说明

一、引导限制性定语从句

用在 such, same, as 等之后，引导限制性定语从句。如：

I live in the same place as Tom does. 我和汤姆住在同处。

He’s not such a fool as he looks. 他并不像看上去的那样愚蠢。

He smokes as expensive a cigarette as he can afford. 他抽一种他买得起的最贵的烟。

二、引导非限制性定语从句

(2) 单独用作关系代词，引导非限制性定语从句，可放在主句之前、之后或中间，且主从句之间一般要用逗号隔开。如：

As was expected, he succeeded at last. 正如我们所料，他终于成功了。

I had coffee after dinner, as is my usual practice. 我饭后喝咖啡，这是我的习惯。

Freddie, as might be expected, was attending the conference. 弗雷迪在参加会议，这是可以预料到的。

三、as与which的用法区别

① 引导限制性定语从句的区别：as用作关系代词引导限制性定语从句时，它通常只用于 such, same, as 等之后，而which 用作关系代词引导限制性定语从句时，则用于除 such, same, as 之外的其他结构。

② 引导非限制性定语从句的区别：which引导非限制性定语从句时，通常只能位于主句后，而as引导的非限制性定语从句位于主句之前、之后或中间。

根据从句谓语动词的特点来看，as在定语从句中作主语时，从句谓语通常要有be或别的系动词，但which不受此限制。如：

Li Ming was late, which (=and this) made Mr. Zhang very angry. 李明迟到了，这件事使张先生非常生气。（不可用as)

根据句意的逻辑性来看，as引导的定语从句只表示一个众所周知或意料之中的事，但which不受此限制。如：

He married her, as [which] was natural. 他和她结婚了，这是很自然的。

He married her, which was unexpected. 他和她结婚了，这是出乎意料的。（不可用as）