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??1. 引導(dǎo)時(shí)間狀語從句，表示“當(dāng)……的時(shí)候”，其用法與when和while類似。例如：As a child (When he was a child), she was sent to six different schools. 此用法中as多表示從句與主句動(dòng)作同時(shí)進(jìn)行，一般不與狀態(tài)動(dòng)詞連用，意為“一邊……一邊……”。例如：She sang songs as she did her homework.

  as 還可以表示一動(dòng)作緊接著另一動(dòng)作發(fā)生，說明另一動(dòng)作的結(jié)果，有“隨著……”的含義。例如：As time went by, we found he was an honest man./As he grew older, he lost interest in everything except gardening.
  例1 It wasn't until nearly a month later________ I received the manager’s reply.
  A. since   B. when
  C. as       D. that
  解析：本題中的as與when一起作為干擾項(xiàng)，容易使同學(xué)往時(shí)間狀語從句上思考，事實(shí)上本題是強(qiáng)調(diào)句，正確選項(xiàng)是D。

  2. 引導(dǎo)原因狀語從句，表示“由于，因?yàn)椤?，相?dāng)于because, 但通常置于句首。例如：As he is a qualified doctor, I trust his advice on medical matters.
  例2 _____ modeling business is by no means easy to get into, the good model will always be in demand.
  A. While  B. Since
  C. As      D. If
  解析：本題中as干擾性很強(qiáng)，很多同學(xué)誤以為是原因狀語從句，但仔細(xì)分析不難發(fā)現(xiàn)正確答案應(yīng)是A（while表示“只要”）。

  3. 引導(dǎo)讓步狀語從句，通?？膳calthough或though通用，但語序不同，although或though用于句首，as用于倒裝結(jié)構(gòu)。例如：Young as I am, I already know what career I want to follow. /Although（或Though）I am young, I already know what career I want to follow.
  as 表示讓步用于倒裝結(jié)構(gòu)，通常將從句的表語、狀語或動(dòng)詞前置。如果表語有冠詞a/an, 需去掉。例如：Great scholar as he is, he is lacking in common sense./Much as I like you, I couldn't live with you. / Try as he would, he couldn't
open the door.

  例3 _____ he has limited technical knowledge, the older worker has a lot of experience.
  A. Since  B. Unless
  C. As      D. Although
  解析： as 雖然有引導(dǎo)讓步狀語從句的用法，但本題不是倒裝結(jié)構(gòu)，故正確答案應(yīng)是D。

  4. 引導(dǎo)方式狀語從句，表示“如，像”。例如：When in Rome, do as Romans do./Do to others as you would have others do to you.
  例4 We wanted to get home before dark, but it didn't quite ______ as planned.
  A. make out    B. turn out
  C. go on  D. come up
  解析： 本題考查動(dòng)詞詞組辨析，題干中的“as planned”提供了重要信息，答案選B。

  5. 固定句型：“主句，as be/do 主語”表示“也一樣”。例如：She’s unusually tall, as are both her parents./He’s a doctor, as was his wife before she had children.
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