as的几种用法：1.做连词，固定搭配as……as，意思是“和……一样”；2.做连词，表示“当……的时候”；3.做连词，表示“因为”4.做连词，表示“尽管”等。
1.as做连词，固定搭配as……as，意思是“和……一样”
例句：
My sister is as tall as me.
我姐姐和我一样高。
He runs as fast as me/I.
他和我跑得一样快。
She is as beautiful as me/I.
她和我一样漂亮。
Being a mother isn't as bad as I thought at first!
做一位母亲并不像我当初想的那样糟！
2.as做连词，引导时间状语从句，意思是“当……的时候”
例句：
My mother was cooking fish as I arrived home.
当我到家的时候，我妈妈正在做鱼。
I was always hard up as a student.
我当学生时总是很拮据。
The crowd cheered as she went up the steps to the bandstand.
当她走上演奏台的台阶时，人群欢呼起来。
All the jury's eyes were on him as he continued.
所有陪审员的目光在他继续下去时都集中在了他身上。
一、“as(否定句中可用so)＋adj．／adv．＋as…”，其基本意思为“……和……一样”。但在实际应用中，此结构在不同的语境中含义差异较大。
1、表示不同人或物同一性质的比较，意为“……和……一样……"。
The tree is as tall as the building(is)．
这棵树和那栋楼一样高。
Michael is as bright as George(is)．
迈克尔和乔治一样聪明。
2、表示同一个人或物不同性质的比较，意为“既……又……”
Alice works as happily as(she)plays(happily)．
艾丽丝愉快地工作，尽情地玩。
Danny is not so wise as he is witty．
丹尼为人风趣，但欠明智。
3、用于表示两个人或物不同性质的比较，表示程度相同或相当，意为“……而……”。
He was as handsome as his wife was beautiful．
他长得非常英俊，他的妻子也长得非常漂亮。
He was as experienced as his brother was green．
他经验丰富，而他兄弟却涉世未深。
二、as…as结构的另一种形式是“as much／many＋名词＋as＋从句”。
Mary has written as many essays as her brother．
玛丽写的文章篇数和她弟弟一样多。
It is as much your fault as your wife’s．
这既是你的过错，也是你妻子的过错。
Henry is as much a hypocrite as·John．
亨利跟约翰一样是个伪君子。
三、若有修饰成分，如twice，three times，half，a quaer等，必须置于第一个as之前。
You are not half as clever as you think you are．你可不像自己想象的那么聪明。
She isn’t going out with a man who is twice as old as she．
她不打算和一个比她大一倍的人出去散步。
You’ve made just as many mistakes as I have．
我和你犯的错误一样多。
We’ve produced twice as much cotton this year as we did lastyear.
我们今年的棉花产量是去年的两倍。
四、as…as结构的另一变体形式是“as＋形容词原级＋名词词组＋as”
I don't want as expensive a car as this.＝I don't want a car as expensive as this．
我不要这么贵的汽车。
Tony is as clever a boy as his brother．
托尼是一个和他兄弟一样聪明的男孩。
五、当as…as与表示重量、数量、时间、距离、价格等的计量名词连用时。往往并不表示比较。而是构成一个形容词组，意为“重达……，多达……，高达……”等。
The river is as deep aslO meters．
这条河深达10米。
Frosts often occur as late as May．
往往到5月份还有霜。
六、“as+原级+as any(或ever)”、“as+原级+as…can be”、“nothing(或no)＋so＋原级＋as…”等结构表达的是最高级意义。即在某种程度上或某方面达到极限或最大限度。
He is as great a mathematician as any．
他是一位非常杰出的数学家。
He is as happy as happy can be．
他幸福无比。
No one is so deaf as those who won’t listen．
最聋者莫过于不听劝说的人。
七、as…as…不表示比较的几个常见句型。
1．as…as possible／sb can尽可能的……
Please answer my question as soon as possible．
请尽快回答我的问题。
The detective is searching the man as carefully as he can．
那个侦探正在尽可能仔细地搜查那个男子的身体。
2．as…as usual／before像以前一样……
She looks as pretty as before．
她看起来和以前一样漂亮
Though they failed，they still worked as hard as usual．
尽管他们失败了，但他们仍像以前一样努力工作。
3．as long as只要，引导条件状语从句
I will stay with you as long as there is a room flree．
要是你有一间空余的房子，我就住在你这里。
You may borrow this book as long as you promise to give itback．
只要你答应归还，你就可以把这书借走。
本回答被网友采纳as ……as …… 译为“和……一样……”
1、基本用法
该结构的基本意思是“与……一样”，其中接形容词或副词的原级，在否定句中，第一个 as 也可换成 so。如：
He doesn't study as [so] hard as his brother. 他学习不如他弟弟努力。
2、涉及数量或程度的用法
若涉及数量或程度，可用“as much+不可数名词+as”和“as many+可数名词复数+as”。如：
He doesn’t pay as much tax as we do / as us. 他没我们交的税款多。
There are not as many restaurants as there were. 现在餐馆没有过去多了。
3、有关词序的一点说明
其间接形容词时，有时该形容词还可修饰另一名词，但这个名词应带有不定冠词(注意词序)。如：
I have as good a voice as you. 我的声音和你一样好。
4.一些带有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
5.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)
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。
(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像犹太人一样富裕本回答被网友采纳
"as...as" 是一个比较结构，用于比较两个事物在某个方面的相似程度或程度的相等性。它的意思是 "和……一样"，表示两个事物在某个方面具有相同的特征、性质或程度。
以下是几种常见的用法：
一、形容词比较：
"as + 形容词 + as"：表示两个事物在某个方面的程度相等。
例句：She is as tall as her sister.（她和她姐姐一样高。）
二、副词比较：
"as + 副词 + as"：表示两个事物在某个方面的程度相等。
例句：He runs as fast as his friend.（他和他的朋友跑得一样快。）
三、动词比较：
"as + 动词原形 + as"：表示两个动作在某个方面的程度相等。
例句：She sings as beautifully as a professional singer.（她唱得和专业歌手一样好听。）
四、副词修饰比较：
"as + 副词 + as"：表示两个动作被同样的副词修饰。
例句：He speaks English as fluently as his teacher.（他英语说得和他的老师一样流利。）
请注意，"as...as" 结构中的形容词、副词或动词形式要根据具体的比较对象来确定。如果要表达不同程度的比较，可以使用 "not as...as" 或 "less...than" 结构。
例如，"He is not as tall as his brother"（他不如他的兄弟高）或 "She sings less beautifully than a professional singer"（她唱得不如专业歌手好听）。