本文主要选取“容/许、烦/劳、许/准、欲、保”等几个动词,讨论它们如何由带小句宾语的动词,演变为情态动词、出现于提升结构,或者演变为情态副词。本文说明它们的语义变化并不是子句主语在表层的提升带动的,而是在特定句式的重新分析过程中实现的。带小句宾语的动词要转变为情态词,基本前提是母句主语不出现;对其中部分动词而言,重新分析要求子句主语也不能出现。汉语“代词脱落”(pro-drop)的特征,是这些动词在句法上发生重新分析、在语义上发生变化的重要因素。 This paper mainly chooses several verbs such as “Rong / Xu, Fan / Lao, Xu / Zhun, Yu, Bao” and discusses how they evolve into modal verbs from verbs with clause objects, As modal adverbs. This paper shows that their semantic changes are not driven by the elevation of clauses in the surface, but are realized during the re-analysis of specific sentence patterns. Verbs with clauses should be transformed into modal words. The basic premise is that the mother clause does not appear. For some of the verbs, the re-analysis requires that the clauses of the clauses do not appear. The characteristics of Chinese “pro-drop ” are important factors in the syntactic reanalysis and semantic change of these verbs.