陈述句的语篇角色

在社会互动中，不管是口语还是书面语，语篇总是有起始、发展和终结。语篇分析或语类研究对语篇的起始、发展与终结的研究成果丰硕。语法学研究陈述句时主要关注语法结构及其意义，很少将陈述句置于语篇中讨论它们扮演的起始、发展和终结的语篇角色。本文在陈述句语法功能的基础上，在系统功能语言学框架下，将陈述句置于大语篇中进行研究，从语篇语义视角讨论陈述句的语篇角色，探索它们的生成机制以及对语篇组织策略的贡献，以此为不同句类的语篇角色研究带来启示。

In social interaction, a discourse (both oral and written) unfolds with a beginning, and then develops and concludes. The beginning, development and conclusion of discourse have been well delved into within the frameworks of discourse analysis and typological studies, and fruitful results have been made. In syntactic theory, declarative is a grammatical phenomenon, whose grammatical structure and meaning are the main foci in studies of grammar. However, the functions of declaratives to begin, develop, and conclude a discourse are rarely talked about. This paper builds on grammatical features of declaratives to investigate the discourse roles of declarative clauses from the perspective of discourse semantics; and explore the generation mechanism of these roles as well as their contribution to the strategies of discourse organization. This study hopes to shed some light on research on the discourse roles of different clause types.