A Study On The Formation And Pragmatic Functions Of Discourse Markers "Ke Bu"(可不) And "Ke Bushi"(可不是)

In modern Chinese,the pragmatic functions of discourse markers“ke bu”(可不)and“Ke bushi”(可不是)are basically consistent.Academic circles mainly discuss the diachronic formation process of them,but there are different views on the relationship between them,and little attention has been paid to the synchronic study.On the basis of many corpus,we examine the diachronic process of the formation of“ke bu”(可不)and“Ke bushi”(可不是),Sort out the common three key stages of them,and analyze the motivation and mechanism of their evolution and the relationship between them.At the synchronic level,we describe and classify the discourse markers from the perspective of pragmatic functions,in order to show the diachronic evolution and synchronic state of discourse markers“ke bu”(可不)and“Ke bushi”(可不是)in a more comprehensive and systematic way.The full text is divided into five chapters:The first Chapter is the introduction.Which introduces the research object,the significance of the topic.At the same time,we summarize the research results and shortcomings of the predecessors.In addition,the theoretical methods and data sources used in this paper are explained.The second chapter to the fourth chapter is the core part of this article.In the second chapter,the origin and formation of the auxiliary verb"ke"(可)and the modal adverb"ke"(可)are investigated.Secondly,according to the diachronic investigation of the corpus,the three key stages of its formation are sorted out.Finally,we analyze the formation motivation and mechanism of"ke bu"(可不).In the third chapter,we take discourse markers"ke bushi"(可不是)as the object of study.First of all,it examines the diachronic evolution stage of"ke bushi"(可不是)and the motivation and mechanism of its formation.Then,it summarizes the different views of the academic circles on the relationship between“ke bu”(可不)and“Ke bushi”(可不是),elaborates the views of the relationship between the two,and analyzes the problems existing in the related views and the causes of misunderstanding.In the fourth chapter,we combine“ke bu”(可不)and“Ke bushi”(可不是),and describe the discourse function of discourse marker"ke bu(shi)"(可不(是))in detail from three aspects:textual cohesion,interpersonal interaction and contextual adaptation.In the fifth chapter,summarizes the main contents and the innovation of this paper.