Subjects of the unmarked passive sentence featuring definitiveness, can act as Topic of sentences in terms of semantic function and thus become objects of illustration, comment and description.

• 然后，对无标志被动句的功能进行了分析，认为无标志被动句的主语都具有定指性，在表意功能上，充当句子的主题语，是被说明、评判、和描写的对象。