"Jiao(教/叫)"can be used to express both passive and causative meanings in modern Chi- nese.This article discusses the origin and development of the two meanings of"Jiao(教/叫)".The passive meaning of"Jiao(教/叫)"was transformed from its causative meaning.Based on examples of"Jiao(教/叫)"and other words,this article holds that Chinese passive sentences and causative sen- tences are inter—transformable if they share the same sentence form and if they are ambiguous seman- tically.