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2020届二轮英语复习 小词精讲 as的用法总结 学案
as可以作连词、介词及关系代词:
adv. 如同,像……一样
As prep. 作为;以……身份;当作;像,如同;当……时
conj. 因为,由于;在......时,随着;以……的方式,像;正如;虽然,尽管
一、 as作介词的用法:
as在介词短语中多翻译为"作为",多用作状语和宾语补足语。如:
l As a party member, I'll take the lead in everything. (状语)
作为党员,我会在每件事上起到带头作用。
l As a young man, he was active in sports.
作为年轻人,他在运动方面很积极。
l They treat me as one of their own children.(宾语补足语)
他们像对待自己的孩子一样对待我。
二、 as作关系代词,引导定语从句,作"正如"解。如:
He is very careful, as his work shows.
As is well-known, Taiwan belongs to China.
as的这种用法,请看2001年的高考题:
l _________is known to everybody, the moon travels round the earth once every month.
*补充:as和which 都可以引导非限制性定语从句。区别有二:
① as引导的非限制性定语从句可以放在句首,而which引导的非限制定语从句只能放在逗号后。
② as引导从句时有“正如”的意义,which没有。
另外,当先行词被the same, such等词修饰时,常用as来引导定语从句。如:
l Such a clever boy as he can learn anything quickly.
l I was reading the same book as he bought yesterday.
*注意区分as 和like :as 和like 都可以译为“像”“正如”。但是,此时as为连词,like为介词。连词连从句;介词加名词。
三、 as作连词的用法:
1. 作"当……的时候",引导时间状语从句。注意与when、 while的用法区别。
但属下列情形时,只用as, 而不用when或while。
l A) 用于表示同一个人的两种动作交替进行,指"一边……,一边……"。如:
The girl dances as she sings on the stage.
He looked behind from time to time as he went forward.
l B)表示两个同步发展的动作或行为,译为"随着……"。如:
As time went by, she became more and more worried.
As children get older, they become more interested in the things around.
l C)表示两个短促行为或事件几乎同时发生。如:
I thought of it //just as you opened your mouth.
Just as the flying worm hit her face, she gave a loud cry.
补充:
① when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。如:
n When he was at college, he could speak several foreign languages. (表示一段时间)
n When the clock struck twelve, all the lights in the street went out. (表示时刻)
② while常表示一段较长的时间,强调主句谓语动词与从句谓语动词同时发生。如:
n Work while you work. Play while you play.
2. as=since, 作"既然"、"由于"解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。如:
l As / Since you're not feeling well, you may stay at home.
l As he wasn't ready in time, we went without him.
3. as=in the way that, 作"像"、"按照……的方式"解,引导方式状语从句。如:
l He speaks English as Americans do.
l Remember, you must do everything as I do.
4. 用于as...as...或not so/ as...as...中,前一个as是副词(副词后面跟形容词、动词、副词),后一个as是连词,引导比较状语从句。如:
l They helped the old man as often as (it is) possible
l I don't speak English so/ as well as he does.
5. 作"虽然"、"尽管"解,引导让步状语从句。常用倒装语序,即adj. /adv. / n.+ as +主语+谓语+主句。如:
l Tired as they were, they walked on.
l Child as he is, he knows a lot. (child前不用冠词)
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