Question

英文as的用法是什么？

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Answer 1

as可以用作介词、副词和连词。
I. as 作介词，意思是 “作为”,“以…身份”，“如同”。Alfred worked as a dustman for the Ellesmere Corporation. 阿尔弗雷德在Ellesmere公司当清洁工。
II. as作连词的用法
1. as…as, 意为 ”和…一样”, 用于形容词或副词的比较，as + adj/adv + as…, 第一个as为副词，第二个as为连词。
1) In 1991, there were twice as many detached houses as semi-detached. 1991年独立式住宅房的数量是半独立住宅房的两
2. 引导时间状语从句，“随着”, “当…时”，和when, while用法相同，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：When she was young, she lived with her grandparents. 她小时候和祖父母住在一起。
3. 引导原因状语从句，“由于”, “因为”, 和because, since用法相同，但他们有区别：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：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
4. 引导让步状语从句，”尽管”, “虽然”, 句子结构稍有不同，例如：
1) Old as he is, he still jogs every day. 他尽管上了年纪，仍然每天慢跑
III. as作关系代词，引导定语从句
1. as引导定语从句与其他词连用
　　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.
　　②用于such...as结构中
I don”t like such books as he recommends.我不喜欢他推荐的那些书.
　　③用于"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. as单独引导定语从句，as单独引导定语从句时,先行词可以是一个词,也可以是一个句子或短语.例如：
1) She is late, as is often the case.她迟到了,这是经常的事。(先行词是整个主语)
3) As you know, I like music.
IV. 几个关于as 的固定搭配：
(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)
As long as you don’t give up, you will succeed some day. 只要不放弃总有一天你会成功。
(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
He likes pop music and classic music as well as rock’n roll. 他喜欢流行音乐古典音乐还有摇滚。
(6) as if/as though 似乎，好像，仿佛
It seemed as if he knew everything in the world. 他似乎知道世界上所有的事情。