英语的介词 as 都有 哪些用法

overrun 是动词overrun的过去分词 overrun-overran-overrun 意思：泛滥，横行，肆虐

这个句子可以先把as it is 略过，直接看成overrun with kids romping in fog rooms

overrun with kids是分词表伴随，就是那种他走过来，手里拿了本书“拿着书”就是一个伴随状态

举例：The film star walked to his car, followed by a crowd of journalists 

          这名影星朝他的小汽车走去，后面跟着一群新闻记者

至于as it is：

这里as不能单独看，要和 it is 看成一起。

这里的as it is是we use “as it is”when things are already bad and we don't want them to get worse，是表示一种没办法直译过来的语气

可以理解为强调

as it is 1．really；in reality事实上We hoped that things would get better,but as it is,they are getting worse．我们本希望情况会好转的,但是事实上,现在情况正在恶化He seemed to be around fifty,but as

as

n acanthoma的变形

as1 [强 æz; 弱əz]

adv

[表示程度]同样地，相同地，一样地，相等地，达到…程度

[后接形容词或分词]被认为，被看作是，(从某种方式)与…对比时

[后接 directed, agreed, promised 等分词]照…一样,按照(规定的、同意的、答应的)方式

诸如，例如

conj

[表示比较]像…(一样)，达到…程度，以至于：

例句： It flew straight as an arrow

它直飞如箭。

You are as good as you think you are

你像你自己认为的一样好。

[表示方式]以…的方式，按照；如同，如同…那样：

例句： Do as you are told

照吩咐去做。

Do as we do

我们怎么干，你就怎么干。

[表示时间] 当…的时候，在…的同时，和…同时；当，正值：

例句： She wept as she spoke

她边说边哭。

Pay as you enter

进来时付钱。

[表示原因]因为，由于，鉴于；既然：

例句： As you object, we won't go

由于你反对，我们不去了。

As you are leaving last, lock up

你是最后一个离开，把门锁好。

[与so连用，表示结果或目的]：以至于，结果是：

例句： The question is so obvious as to need no reply

这问题很清楚，不必回答。

[表示让步，词序倒装]虽然，尽管，纵：

例句： Tall as she was she couldn't reach the oranges

她虽然长得这么高，仍够不着那些橙子。

Strange as it seems,it is so

虽然看来很怪，但事实如此。

[口语][引导名词从句，在主从复合句的主句中]＝ that:

例句： I don't know as I should

我不知道我该这么做。

I don't know as I do

我不知道我知道。

[与 so 连用，表示目的]为了，为使，以便：

例句： Students should take notes so as to make revision easier

为了便于复习，学生应该记笔记。

[常与 so 连用，表示比例或关系]正像；随着…：

例句： As the wind blew harder,so the sea grew rougher

风越刮越大，海浪也越来越汹涌。

仿佛，好像( ＝ as if)：

例句： It seems as she's never happy

她似乎生活得一点也不愉快。

根据；[与 go 连用]按照…的一般标准来说：

例句： as far as it goes

就一般标准来说，就其本身来说

[口语][引导名词从句， ＝ that]

[方言]比；与其…(不如…)( ＝ than)

pron

如(情形或事实所表示)；这一点，这一事实，那一情况

[用于比较，前为such 或 the same，或与后跟形容词的 as 连用，引导定语从句，等于who，which或that]照此；如；像…样的人(或事物)；凡是…的人(或事物)

也一样( ＝ and so)

[方言][引导定语从句,＝ who,whom,which 或 that]

prep

当作；作为；以…的资格，以…的身份：

例句： He poses as a friend

他摆出一副朋友的样子。

I do not think much of her as a musician

她作为一名音乐家，我认为不怎么样。

像，如同，跟…一样：

例句： The risk is as nothing compared to the gain

所冒风险与所得相比不足挂齿。

The thief disguised himself as a policeman

那贼乔装打扮成警察。

[表示比较]像…(一样)：

例句： as early as 1848

早在1848年

eyes as clear as crystals

水晶般明亮的眼睛

例如：

例句： a card game, as bridge

一种牌戏，例如桥牌

In some words in English the initial h is not sounded,as honour,hour,honesty,etc

英语里有些词如 honour，hour，honesty等等的首字h不发音。

为了…的目的：

例句： I only said it as a joke

我只是开玩笑说说而已。

以…的形式：

例句： We all start life as babies

我们都是从婴儿开始人生的旅程的。

由于…的理由[as being的省略形式]：

例句： He was detained as suspects

他因是嫌疑犯被拘留。

起…的作用；(在剧中)扮演…的角色：

例句： The illustration shows MrJohn as prince in Hamlet

这个插图说明约翰先生在《哈姆雷特》一剧中扮演王子这个角色。

当某人在…的时候：

例句： As a child,he was rather naughty

他小时候挺淘气。

as是英语考试中用得比较多的一个词，也是很多学生反映较难掌握的一个词。as的词性较多，用法也较复杂，因此掌握该词会对 英语学习 很有帮助。下面是我整理的一些关于as用法小结， 希望让大家更好地认识as这个单词，提高英语水平。

as用法小结

一、as作为从属连词，可以引导下列从句：

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**和那部**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asas的常见句型：

(1)asas possible

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

(2)asas 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。

知识拓展2：一些带有asas结构的常见 短语 归纳：

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

as strong as a horse健壮如牛 as poor as a church mouse一贫如洗

as cool as a cucumber十分冷静;镇定自若

二、as作为关系代词，可以引导定语从句，既可以单独使用，也可以与其他词连用，其用法要比that和which更为复杂，而且as在定语从句中可以充当主语、宾语、介词宾语、表语，可以指人也可指物。要注意引导定语从句时。

1、引导限制性定从句。

①用于the sameas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suchas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。

三、as作为介词的用法：

1 表示“好像”。如:He dressed as a policeman

2 表示“作为”，“当作”。如：I found a job as a guide

3 表示某人是什么某身份时。如：As a child , she was sent to abroad

He came to China as a tourist five years ago他五年前以游客的身份来过中国。

4 as引导的介词短语大多用作状语,as译为"作为";少数情况可引起宾语补足语。如:

As a Party member, I'll take the lead in everything (状语)

She works as a model (状语)

She has me as one of her best friends(引起宾语补足语)

四、as作为副词的用法：

1、意思为“相同地”，“ 同样地”=(to the same degree or amount; equally)

例如：They don’t have as many airplanes他们没有同样多的飞机。

This dress is twice as expensive as that one

2、意思为“像，如”等。如：As before, he remained unmoved

总之，通过以上的分析，我们对as的词性和用法有了比较全面的理解和把握，才能在实际的运用中做到心中有数，应付裕如。

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