关于as的用法

as [æz]
1. prep.（介词）作为 We’ll have a job as a cleaner for you. 我们有一份清洁工的工作给你。
2. conj.因为； As it is raining, we have to put off the match.因为下雨，我们只得推迟比赛。
辨析：as because for since
这些连词均含有“因为”之意。
as:从属连词，语意较because, since弱，着重在主句，所表示的原因或理由是“附带的、已知的、明显的”。
because:从属连词，语意强，着重直接的原因或理由，所引出的从句是全句的重心，用以回答why提出的问题。
for:并列连词，语气较弱，所引出的句子一般放在后面，表示附带说明的理由或推断理由。
since:语意比because弱，但比as强，一般用于表示“由于大家已知的事实”。含有勉强、不好之意。“既然”
3.conj.当 ... 之时
形容词+as+主语，构成一种倒装结构，是as表“尽管”的特殊用法。
例如：Tired as she was,she finished the homework on time.
尽管她很累了，她仍然按时完成了作业。
We should take notes as we read. 我们要边读边做笔记。
辨析：when while as
这些连词均可表示“当……时”引出时间从句。
when:所引导的从句，其谓语动词既可是持续动词，也可是短暂动词；谓语动词动作发生的时间可以与主句谓语动词的动作是同时，或之前、之后。
while:句中的谓语动词应为持续动词，不用短暂动词，谓语动作发生的时间通常与主句谓语动词动作发生时间是同时。
as:侧重指从句与主句的动作同时进行，谓语动词可以是持续性的，可以是短暂性动词。
4.conj.像 ... 一样；She felt just the same as he did. 她和他的感受相同。
You ought to do as Paul tells you.
你应按照保罗吩咐的做。
辨析；as like
这两个词均有“像”之意。as:从属连词，引出方式从句。like:是介词，后面跟的是宾语。
5.conj.；尽管
形容词+as+主语，构成一种倒装结构，是as表“尽管”的特殊用法。
例如：Tired as she was,she finished the homework on time.
尽管她很累了，她仍然按时完成了作业。
辨析：though although as even though
这些连词均可表示“虽然，尽管”之意。though:和although在意义上几乎毫无区别。
although:与though在意义上相似，但文体上是比较正式用词，语气比though强。
as:引出让步状语从句只用于倒装语序结构中，语气强于上述两个连词。
even though:（＝even if），意为“即使”，引导让步状语从句。though也引导让步状语从句，意为“虽然”；even though有退一步设想的意味，与though不同。though引导的句子所说的是事实，even though引导的句子所说的则不一定是事实。例如：
He will not tell the secret even though（even if）he knows it．
即使他知道这个秘密，他也不肯说出来。
He will not tell the secret though he knows it．
他虽然知道这个秘密，但他不会说出来。
6. adv.同样地
This film is as interesting as that one.这部电影和那部电影一样有趣。
7.pron (引导从句,对前述内容作补充)本情况,该事实
We are tired, as anyone can see.
我们累了,这是有目共睹的。
短语：
as … as /像…一样 （not as \so.......as 不比；不如）
as a popular saying goes 俗话说；常言道
as a result 结果
as for 至于 ；对于
as if/though 好像
as long as 只要
as soon as 一。。。就
as usual \before 像往常\ 以前一样
as we know 众所周知
as well /也；并；和；同
as... as possible (sb can)尽可能。。。

as...as的用法

as...as意为"和……一样"，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。其基本结构为：as+ adj./ adv. +as。例如：

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

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

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。

若有修饰成分，如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。

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。

(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。

一些带有as...as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