当状语从句的主语与主句的主语一致时,且从句谓语含有be动词是,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; (2) 连词( though, whether , when)+形容词;(3) 连词(whether, as if ,while )+介词短语;(4) 连词(when , while , though )+ 现在分词; (5) 连词(when ,if ,even if ,unless ,once ,until, than , as ) + 过去分词; (6) 连词(as if ,as though ) + 不定式。如:
He looked everywhere as if (he was)in search of something .他到处看似乎在找什么东西。
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。
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.美国总统布什在与胡锦涛主席会谈时,感谢中国在六方会谈中起的重要作用。
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