Abstract : this paper focuses on the coherent function of the chinese expression " nashi " and the process of solidification of " nashi " . " shi " went through further grammaticalization : from copula to a element of solidification structure 摘要本文讨论现代汉语, “那是”的对话衔接功能及其固化说法的形成过程,认为“那是”的“是”发生进一步语法化:从判断词变为固化形式的不可分析的成分。