There has always been a long controversy over the properties of ＂bei（被）＂ in Chinese passive sentences. Some scholars believe that ＂bei＂ is a verb carrying the passive meaning and the ＂bei＂ sentence is an active sentence with ＂bei＂ as the main verb. However, this research has proved that the aphasiacs have the same understanding of the notional verbs and active sentences as the normal people but they have serious misunderstandings and agrammatism of the functional category and passive sentences, which has proved that ＂bei＂ belongs to t...
