Lexical and construcional perspectives for semantic change

本研究的主要观点是：词汇和构式视角是研究语义变化的基础，同一个表达方式可以被看作是语法化或词汇化的例子，这取决于它的分析视角。带着这样的双重视角，我尝试对日语和其他语言（包括英语）中的祈使句进行共时和历时的分析。这些调查以在会议上发言的形式和通过期刊文章进行宣传。本文的研究成果可以为相关的研究领域做出理论贡献，如强调构式重要性的认知语言学，以及最新的关于构式化的语法化/词汇化理论。

The main claims of this research are that lexical and constructional perspectives are essential for the study of semantic change and that the same expression can be regarded as an example of grammaticalization or lexicalization, depending on its perspective for analysis. With these dual perspectives in mind, I have attempted several synchronic and diachronic analyses of imperative expressions from Japanese and some other languages, including English. These surveys were publicized in forms of presentations at conferences and through journal articles. The findings of this research can make theoretical contributions to related research fields, such as cognitive linguistics, which emphasizes the importance of constructions, and the latest grammaticalization/lexicalization theory concerning constructionalization.