中文摘要：

本文探讨反诘类语气副词“何必／何苦”的词汇化与语法化。首先对“何必/何苦”的定位问题进行梳理；其次从历时角度考察“何必／何苦”语义演变的规律和特点；最后就词汇化与语法化的联系与区别进行思考，并论证它们词汇化与语法化的动因和机制。

英文摘要：

In this paper, we discuss about the lexiealization and grammaticalization of one kind of ask-in-retort mood-adverbal： ＂hebi＂ and ＂heku＂. In the first place, we bring for- ward the research plane after hackled the problem of ＂h~bi/heku＂; In addition,we study the disciplinarian and characteristic of semantic evolvement of ＂hebi/heku＂, from the point of view of diaehronie; Then, we think about the discriminate and affiliation of the lexicalization and grammaticalization, and discuss their mechanism and causation during the process of lexicalizafion and grammaticalization.