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名词谓语句、句末名词句和“形式名词+だ”型助动词句都以“名词+だ”结尾,但是三种句式中的“名词+だ”表现出不同的语法化倾向。构成名词谓语句的典型名词为事物名词,意义充实,不易发生语法化。构成助动词句的名词为形式名词,意义淡化,符合语法化的动因。构成句末名词句的事件名词位于二者之间,一方面表现出语法化倾向,但是语法化不够彻底。在结构上,名词谓语句多采取主题句结构,不利于语法化机制——重新分析的进行,助动词句多采取无主题句结构,有利于重新分析的发生。句末名词句具备主题句和无主题句两种结构,位于名词谓语句和助动词句之间。它们按照“名词谓语句→句末名词句→”形式名词+だ“型助动词句”的顺序,“名词+だ”的语法化从无到有、依次升高。
The noun predicate, the final noun phrase and the “formal noun + だ” type a verb end with “noun + だ ”, but “noun + だ” in the three kinds of sentence shows different grammar Tendency. The typical nouns that constitute the nouns predicate are things nouns, which are meaningful and difficult to be grammaticalized. The nouns that form auxiliary verb form the formal nouns, the meaning is diluted, and the motivation of conforming grammaticalization. Event nouns constituting the final nouns are located between the two, on the one hand to show the tendency of grammaticalization, but grammaticalization is not thorough enough. Structurally, nouns predicative sentences mostly take the structure of the subject sentence is not conducive to the grammaticalization mechanism - the re-analysis of the progress, aids-based sentences to take more non-thematic sentence structure is conducive to re-analysis. Sentences at the end of the sentence with thematic sentences and no topic sentence two structures, located between the noun predicate and the auxiliary verb. They follow the order of “nouns predicate final nouns ” form nouns “” type auxiliary verbs “, the grammaticalization of ” nouns + だ "goes up from scratch.