语言中句子的分类及其功能是比较陈旧的话题,并且已经基本类别清楚,各司其职。但是在言语交际中,我们会经常发现某些类别语句的言语意义发生改变,导致语句功能发生变异的现象。本文从社会语言学角度出发,探讨陈述句在语用、文化、社会等因素的作用下,发生语句功能改变这一语言现象的语用根源。 The classification of sentences in sentences and their functions in language are relatively old topics, and have been clearly defined in their basic categories and their respective functions. However, in verbal communication, we often find that the meaning of words in certain categories of sentences changes, resulting in the phenomenon of the variation of sentence functions. From the perspective of sociolinguistics, this essay explores the pragmatic roots of the linguistic phenomenon in which sentence functions change under the influence of pragmatic, cultural and social factors.