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什么叫做状语从句的省略句

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什么叫做状语从句的省略句
一般说来省略现象多出现在下列五种状语从句中:由 when ,while ,as ,before,after ,till,until,once等引导的时间状语从句;由whether ,if ,unless 等引导的条件状语从句;由 though ,although ,even if ,whatever等引导的让步状语从句;由 as ,than 等引导的比较状语从句;由as,as if ,as though 等引导的方式状语从句.上述状语从句在省略时,并非任何成分都可以省略而是遵循下面原则:
  (1)当状语从句的主语与主句的主语一致时,可以省略状语从句的主语和系动词be ,这时从句中可出现如下结构:
  ① 连词(as,as if ,once)+ 名词
  如:Once (he was)a worker ,Pang Long now becomes a famous singer .庞龙曾经是个工人,现在变成一位著名的歌手.
  ②连词( though,whether ,when)+形容词
  如:Work hard when (you are) young ,or you'll regret.趁年轻要努力学习,要不然你会后悔的.
  ③连词(whether,as if ,while )+介词短语
  如:He looked everywhere as if (he was)in search of something .他到处看似乎在找什么东西.
  ④连词(when ,while ,though )+ 现在分词
  如:While (he was) holding talks with President Hu Jintao ,US President George W.Bush thanked China for its important role in the Six-Party Talks.
  ⑤ 连词(when ,if ,even if ,unless ,once ,until,than ,as ) + 过去分词
  如:The exhibition is more interesting than (it was) expected .这次展览比被预料的有趣的多
  ⑥ 连词(as if ,as though ) + 不定式
  如:Olympic gold medallist hurdler Liu Xiang opened his lips as if (he were) to speak .奥林匹克金牌获得者跨栏运动员刘翔张开嘴好象要说什么.
  (2)当从句的主语是 it,谓语动词中又含有系动词be 时 ,可以把it和系动词be一起省略.此时构成连词(if ,unless ,when ,whenever)+形容词的结构.如:Unless (it is) necessary ,you'd better not refer to the dictionary.如果没有必要,你最好不要查字典.
  各种状语从句的省略现象列举如下:
一、时间状语从句中的省略
When (she was) very young,she began to learn to play the piano.她很小时,就开始学习弹钢琴. 再答: 注:as在引导时间状语从句时,没有这种省略现象。我们不可说As walking, she found a nice shining thing on the ground.
   二、地点状语从句中的省略
   地点状语从句的省略常用下列结构:where(ver) possible, where(ver) necessary,
   Lay these books where possible you can find them easily. 把这些书放在你可能容易找到的地方。
   Put in articles wherever necessary in the following passages. 在下列文章中需要的地方填入冠词。
   三、条件状语从句中的省略
   常用的句型是:if necessary, if possible, if true, if anyone等。如:
   Send the goods now if (they are) ready. 货物如果准备好了,请送过来。
   He will come if (he is) asked. 如果叫他来,他就来。
   If (it is) necessary, ring me at home. 如果有可能,朝我家里打电话。
   Come along with me if (it is) possible. 如果有可能和我一起去吧.。
   If (it is) true, this will casue us a lot of trouble. 如果是真的,这会给我们带来很多麻烦。
   There are few people nowadays, if (there are) any, who remember him. 很少有人能记起他。
   You should stay where you are, unless (you are) asked to leave. 你应呆在你现在的地方不动,除非叫你动。
   四、让步状语从句中的省略
   He is a good man, though sometimes (he is) rather dull. 他真是个好人,尽管有时有点无聊。
   Even if (I am ) invited to, I won’t go to such a bad lecture. 即使邀我去,我都不想听如此坏的报告。
   五、比较状语从句中的省略
   She can play the piano just as wonderfully as you (do). 她钢琴弹的我你弹的一样好。
  She has finished the work earlier than (it has been ) expected.