as 用法小结new课件.ppt

as 用法小结
介词
3
连词
1
关系
代词
2
副词
4
4

1. as用作连词引导时间状语从句
as表示当……的时候,用法与when,while相似。用as时,强调主句和从句的动作同时发生,意为一边。。一边。。。一般不与状态动词连用
She sang songs as he did his homework.
as可以表示一动作接着另一动作,说明另一动作的结果,有“随着。。的含义
As time went by,we found he was an honest man.
As he grew older,he lost interest in everything except
gardening.
2. 引导原因状语从句
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"。
(1) He will eed because he is in ,因为他很认真。
(2) Since you are so sure of it he”ll believe ,他会相信你的。
(3) As rain has fallen, the air is ,空气比较清爽。
3. as作连词引导让步状语从句
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";as所表示的语气较强,引导的让步状语从句用倒装语序;
young as he is,he is lacking mon sense.
5. as作连词引导方式状语从句
”如””像””按照”等
when at Rome, do as the Romans do.
I want you to tell my friend your very interesting experience exactly as you have told it to me
二、as作关系代词的用法
关系代词as引导定语从句时,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。
:
①用于the same...as结构中
This is the same book as I read last week.
②用于such...as结构中
I don’t like such books as he mends. ③用于"so +adj. + a/an + n. (单数) + as "结构中
I am not so strong a man as I 。
(先行词),从句可以位于句首,句中或句末。___I explained on the telephong,your request will be considered at the next meeting.A. when B. After C. as D. since
2. as单独引导定语从句时,先行词是一个句子或短语。例如:
(1) She is late, as is often the ,这是经常的事。(先行词是整个主句)
(2) To shut your eyes to facts, as many of you do, is --你们好多人都是如此的愚蠢。(先行词是不定式短语)