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语法:被动结构与系表结构的区别

"be+过去分词"这个结构并不都是被动语态,也可能是系表结构。被动语态与系表结构主要区别是:被动结构表示一个动作,而系表结构表示主语的特点或所处的状态,试比较下面的句子:
  被动结构
  The enemy was soon surrounded by us.
  系表结构
  The house is surrounded by trees.
  被动结构
  She was bitten by the dog in the darkness. 
  系表结构
  I was excited by the news that my husband got promoted.
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