the eggs laid by the hen are still lying there.

句中the eggs laid by the hen 中我们英语老师说这个句子时被动语态，可被动语态不是be +过去分词吗这里只有一个laid并没有出现be动词啊

本句的谓语是are lying。 laid by the hen 是过去分词短语做定语，修饰the eggs。不能用were laid by the hen 。

laid by the hen在这个句子中是用来修饰主语the eggs的，相当于定语，被动时态的助动词省略。如果改成定语从句the eggs that were laid by the hen are still lying there.中的be动词就不能省略，它要充当从句中的句子成分。

此处可理解为定语从句which were laid by the hen 的省略，省去了which were

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