The paper briefly discusses and analyses the basic features of pragmatic presupposition and its various pragmatic functions in speech communication, combined with the text analysis, information focus and style effect.

• 本文从语用学的视角出发，结合语篇分析、信息焦点和文体效应等初步地讨论和分析了语用预设的基本特征以及在言语交际中的不同语用功能。