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1、状语从句的省略状语从句的省略一、连词+介词短语e.g.While(she was)at college,Delia wrote a novel.While(he was)in London,he studied engineering.二、连词+形容词e.g.If(it is)possible,let me know beforehand.Though(he was)exhausted,he stayed up late.尽管疲惫不堪，他仍很晚才睡。Whenever(it is)possible,the children play outside.只要可能，孩子们总在外边玩耍。Avoid st
2、ructures of this kind wherever(it is)possible.只要可能，都要避免这种结构。三、连词+现在分词e.g.She trembled a little while(she was)doing so.He was carried away when(he was)watching wrestling on TV.They were surprised by her openness when(she was)talking about her private life.四、连词+过去分词e.g.He will come if(he is)asked.如被邀请
3、，他就会来。When(she was)asked,she confirmed that she was going to retire.问她时，她证实了她将要退休。While(she was)locked up in prison,she wrote her first novel.在狱中时，她写出了第一部小说。When(it is)taken according to the instructions,the drug has no side effects.按说明服用，本药无任何副作用。五、连词+不定式e.g.Smiling pleasantly,the stranger turned as if(he was)to speak to me.那个陌生人面带愉悦的笑容，转身向我，似乎想对我说话。注：只有那些只能用作连词的词省略时才能接各种形式,而以下两 句中的before和after是介词，省略后的动词只能用动名词：e.g.Before giving evidence the witness had to take an oath.作证前证人要先宣誓。It would be wise to buy a house after having it appraised.先估价再买房子是明智的。