文章认为，施事在被动句中有跟句外的背景进行对比，以强调施动者是此而非彼的作用，因而是被动句中的话题焦点。
It is thought that the action doer is the topic focus of a passive sentence, which emphasizes the role of subject in contrast with the sentence background.
典型场合中，在“主位推进”条件下使用被动句的情况最多，而在强调施事条件下使用被动句的情况最少。在语料库中还出现了“不该用而用”即被动句的误用情况。
In the classical and "theme propulsion" situation the usage of passive sentences is more than others, and while emphasizing the condition of agent the usage of it is few.
典型场合中，在“主位推进”条件下使用被动句的情况最多，而在强调施事条件下使用被动句的情况最少。在语料库中还出现了“不该用而用”即被动句的误用情况。
In the classical and "theme propulsion" situation the usage of passive sentences is more than others, and while emphasizing the condition of agent the usage of it is few.
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