The article proves formally that irrealis category in modern Chinese is both a prototype and a semantic and grammatical category.
本文从形式上证明了现代汉语非现实范畴是一种典型范畴，也是一种语义语法范畴。
2
The co-occurrence restrictions between modality and aspect markers can be explained unitarily in terms of the concept distinction between static and dynamic, and that between realis and irrealis.