Diachronic Development and Semantic Extension of Japanese Expressionsof Ability and Degree of Difficulty

在表示难易程度的表达方式方面，笔者在前人研究的基础上，从历时变化的角度考察了带有辅助形容词的表达方式。通过考察，描述了难易表义的变化方向和类型，指出了难易表义之间的不对称关系。在表示能力方面，笔者在前人研究的基础上，对“啊呵族”、“呀啦族”等助动词的表达方式进行了详细的考察。同时，笔者认为焦虑表达是从能力表达中衍生出来的，并对焦虑表达的历时性发展进行了概述。

With respect to expressions denoting degree of difficulty, I examined expressions with auxiliary adjectives based on my previous research from the viewpoint of diachronic change. Through the examination, I described the direction and types of their semantic change and pointed out asymmetrical relations between expressions of difficulty and those of easiness. With respect to denoting ability, I made detailed observations on expressions with auxiliary verbs such as “ahe-zu” or “yara-zu” based on previous studies. I also maintained that expressions of anxiety are derived from those of ability and overviewed the diachronic development of them.