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as作为从属连词，可以引导下列从句： 篇一

1、as引导时间状语从句，意为“正当……的时候”、“一面……一面……”、“随着……”，从句可放主句之前或主句之后。

As I was coming here, I met your brother.

As he walked on, he felt himself getting more and more tired.

【知识拓展】：as与when, while都是引导时间状语从句的从属连词，含义都是“当……的时候”。但它们有区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生；用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生；用as时，主句和从句的动作同时发生，具有延续的含义。例如：

It was snowing when he arrived at the construction site.他到达工地时，天正在下雪。

He was watching TV while his mother was cooking.他母亲做饭时他在看电视。

You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。

2、as引导原因状语从句，意为“由于”大多位于主句之前，偶尔在前或后。

As this question is of great importance, we will discuss it once again.

Water, as it occurs in nature, is never very pure.

We couldn‘t send the children to school as life was very hard in those days.

【知识拓展】：as, because, since都可以表示因果关系，连接原因状语从句，含义是“因为，由于”，但它们有区别：because表示的语气最强；as一般放在句首，语气较弱，较口语化；since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作“既然”。例如：

He will succeed because he is in earnest.他一定会成功，因为他很认真。

Since you are so sure of it he’ll believe you.既然你对此如此有把握，他会相信你的。

As rain has fallen, the air is cooler.因为下过雨，空气比较清爽。

3、方式状语从句，意为“如同”、“按照……的方式、样子、办法”。As从句总跟在主句之后。

You must try to hold the tool as I do. 象我那样拿住工具。

Leave things as they are. 让那些东西保持原样。

3、as引导让步状语从句，意为“虽然”，多在主句之前，且多用倒装。(应将从句主要成分的形容词、副词、原形动词、不加冠词的单数名词置于as 前面)

Difficult as it is, we should not give it up.

Child as he is, he knows something about electricity.

【知识拓展】：as与although (或though)，however (或no matter how)等都可以引导让步状语从句，含义是“虽然，尽管”，但它们有区别：although语气稍正式些，可放在句首，也可放在句中，主句中不能再用but，但可以用yet;as所表示的语气较强，引导的让步状语从句用倒装语序；however引导让步状语从句时，它的后面可跟形容词或副词，也要用倒装语序。例如：

Although he is quite old, he still jogs every day.他虽然年纪相当大，仍然每天慢跑。

Strange as it may seem, nobody was injured in the accident.

这次意外虽然显得令人不可思议，却没有人受伤。

However hard he may try, he will not attain his goal.无论他怎样努力也达不到目标。

4、as引导比较状语从句，意为“和……一样/不一样”。 表示同级的比较。使用时要注意第一个as为副词(意为“那么”“如此”)，第二个as为连词(引导的比较状语从句常常用省略)。其基本结构为：as+ adj./ adv. +as。例如：The line AB is as long as the line CD (is).

This film is as interesting as that one.这部电影和那部电影一样有趣。

Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。

注意1：其否定式为not as/so +adj./ adv. +as。例如：

This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。

注意2：“as…as…”结构前加上表示程度或倍数的词语作为修饰成分，如just, nearly, almost, twice, three times, half, a quarter等，则须置于第一个as之前。例如：

Your bag is twice as expensive as mine.你的袋子比我的贵一倍。

This is just as important an experiment as that(is).

There are now three times as many schools in this city as(there were )ten years ago.

【知识拓展1】：几个关于as...as的常见句型：

(1)as...as possible

Please answer my question as soon as possible.请尽快回答我的问题。

(2)as...as usual/before

She looks as pretty as before.她看起来和以前一样漂亮。

(3)as long as... (引导条件状语从句)

It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划。

as作为介词的用法： 篇二

1、引导限制性定从句。

①用于the same...as结构中。

This is the same book as I read last week.这本书和我上周读的那本是一样的。

He isn’t the same person as he used to be.

②用于such...as结构中。

I have never heard such story as he is telling.

I don’t like such books as he recommends. 我不喜欢他推荐的那些书。

③用于“as/so +adj. + a/an + n. (单数) + as ”结构中

I am not so strong a man as I was.我已经没有从前那么强壮了。

2、引导非限制性定从句，修饰整个主句或主句的一部分，可在句首、句中、句末。当 as 在从句中做主语时，从句的谓语动词常是被动语态或系表结构。在从句中做宾语时，从句的谓语动词常是情态动词 + 动词原形。

As is often the case, we have overfull filled the production plan.

This machine, as might be expected, has stopped operating.

He came very early this morning, as (was) usual.

She is late, as is often the case.她迟到了，这是经常的事。(先行词是整个主句)

To shut your eyes to facts, as many of you do, is foolish.

对事实视而不见--你们好多人都是如此的愚蠢。(先行词是不定式短语)

此外还有： as has been said before/ as may be imagined / as is well known/ as we all can see/ as often happens/ as has already been pointed out等等。

用法2：阐述事物A的行为或者其所发出的动作和事物B的行为是一样 篇三

首先，我们来想一想，什么词能修饰行为动词(action verb)？没错，是副词。我们看例句，I always unwrap electronic devices “carefully”。

因此，如果我们想说A和B两个同学都是很小心unwrap电子产品的人，我们可以把副词“carefully”放到As和as之间。

例句：John unwraps electronica devices as carefully as Michael does.

因此，As…as用法2的注意事项是我们要用一个行为动词引导As…as之间的副词，比如，An apple “grows” as slowly as an orange does.

注：本质上在As…as词组中，第二个as实际上是在引导一个名词从句，但我们往往仅保留从句的主语，即名词，而省略其他部分。看例句，The weather this summer is as bad as last year’s (weather is)。

as…as结构的几点用法说明:

几个关于as...as的常见句型： 篇四

(1)as.。.as possible

Please answer my question as soon as possible.请尽快回答我的问题。

(2)as.。.as usual/before

She looks as pretty as before.她看起来和以前一样漂亮。

(3)as long as.。. （引导条件状语从句）

It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划。

(4)as far as

He walked as far as the railway station yesterday evening.昨天傍晚，他一直散步到火车站。

(5)as well as

She cooks as well as her mother does.她烧菜烧得跟她母亲一样好。

些带有as...as结构的常见短语归纳： 篇五

as busy as a bee像蜜蜂一样忙碌

as easy as ABC像ABC一样容易

as deep as a well像井一样深

as light as a feather像羽毛一样轻

as soft as butter像黄油一样软

as rich as a Jew像犹太人一样富裕

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