The house seemed to have been broken into.请问to 后是什么成分?

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The house seemed to have been broken into.请问to 后是什么成分?

broken into.固定短语,破门而入,闯入.

主系表结构
系动词 seem ,类似还有appear, become, grow, get, turn, remain 等
动词不定式做表语
(注意:连系动词不能够单独作谓语,他们必须和表语一起工作构成谓语)
to have been broken into 动词不定式的现在完成时被动结构