日语条件句｢と｣｢ば｣｢たら｣｢なら｣等有多种意义用法,存在从一种意义用法向其他意义用法扩张的现象。迄今为止主要从逻辑语义､功能语用和对比分析等视角探讨这个问题,对条件句的主观认知动机的考察较少。本论文从共时的视角,用(交互)主观化理论探讨日语条件句构式中的语义扩张。认为日语条件句构成“非主观性→主观性→交互主观性”的连续统,这个语义扩张现象与认知动机相关,是对客观世界进行客观识解与主观识解的体现｡

There are many semantic expansions in Japanese conditional expressions “To””Ba””Tara””Nara”. So far researches are mainly from logic semantic, functional pragmatic and comparative analysis and are rare from subjective cognitive motivation. This paper tried to explain the semantic expansions of Japanese conditionals from synchronic perspectives by using(inter)subjectivity theory. This paper concluded that Japanese conditionals appear as a continuum of ‘non subjectivity → subjectivity → intersubjectivity’. The semantic expansion of Japanese conditionals is closely related to the cognitive motivation, and being the result of objective construal and subjective construal upon the world.