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2008-10-30 03:55:54

•   as可以作连词、介词及关系代词。现将其用法小结如下:
  一、 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。
  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:
  When he was at college, he could speak several foreign languages。 
  When the clock struck twelve, all the lights in the street went out。
     
  ② while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:
  Work while you work。 Play while you play。 
  ③ 但属下列情形时,只用as, 而不用when或while。
    
  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。
     
  B)表示两个同步发展的动作或行为,译为"随着……"。如:
  As time went on / by, she became more and more worried。 
  As children get older, they become more and more interested in the things around them。
     
  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。
    
  D) 后接名词表示某一年龄段时,用as。如:
  As a young man, he was active in sports。 
   =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:
  As / Since you''''re not feeling well, you may stay at home。 
  As he wasn''''t ready in time, we went without him。 
   =inthewaythat,作"像"、"按照……的方式"解,引导方式状语从句。
    如:
  He speaks English as Americans do。
  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,后一个as是连词,引导比较状语从句。
    如:
  They helped the old man as often as possible。 
  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:
  Tired as they were, they walked on。
  Child as he is, he knows a lot。 (child前不用冠词)
  二、 as作关系代词,引导定语从句,作"正如"、"这一点"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:
  is known to everybody, the moon travels round the earth once every month。
    
  A。 It B。 As C。 That D。 What
  (字母下划横线的为正确答案)
  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:
  Such a clever boy as he can learn anything quickly。
     
  I was reading the same book as he bought yesterday。 
  三、 as作介词的用法:
  as引导的介词短语大多用作状语,as译为"作为";少数情况可引起宾语补足语。如:
  As a League member, I''''ll take the lead in everything。
     (状语)
  She works as a doctor。 (状语)
  They have me as one of their own children。(引起宾语补足语)。

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  2008-10-30 03:55:54

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2008-10-29 13:26:39

• 楼上的也真是的，复制了这么多！

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  2008-10-29 13:26:39

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