介词短语在句子中的作用？

如题所述

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同学您好：介词短语作句中的作用
介词不能单独担任一个成分，必须构成介词短语来担任一个成分。能和介词构成短语的有：
·名词：who’sknocking at the door?
·代词: you’re always thinking of others.
·动名词：Areyou interested in going with us?
·what引导的从句：he thought over what he had better do.
·由what,why, when, where, how, who等引导的不定式短语：shegave a talk on how to fight thedisease.
·另一个介词：I sawher from across the street.
·副词或形容词：Iheard someone calling me from below.
·复合结构：I hadno objection to Dinny marrying him.
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