語法:被動結構與系表結構的區(qū)別 - 四級語法

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"be+過去分詞"這個結構并不都是被動語態(tài),也可能是系表結構。被動語態(tài)與系表結構主要區(qū)別是:被動結構表示一個動作,而系表結構表示主語的特點或所處的狀態(tài),試比較下面的句子:
    被動結構
    The enemy was soon surrounded by us.
    系表結構
    The house is surrounded by trees.
    被動結構
    She was bitten by the dog in the darkness. 
    系表結構
    I was excited by the news that my husband got promoted.