运用语料库可以较为准确、客观地考察语言演变的历程,揭示其中隐含的规律。本文从历时语言学研究的视角出发,聚焦近义机能辞「とたん(に)「」かと思うと「」やいなや」和「が早いか」。通过对大量真实语料的定量分析,考察了它们近百年来使用情况的变迁。随后,比较核心功能的异同,探讨它们在使用上出现消长的原因。 Using the corpus can more accurately and objectively examine the process of language evolution, revealing the implied laws. From the perspective of diachronic linguistic research, this dissertation focuses on the near-term functional speech “と た ん (に)” “か と 思 う と” “や い な や” and “が い い ka.” Through quantitative analysis of a large number of real corpora, we examine their changes in the past hundred years. Afterwards, compare the similarities and differences of the core functions, and discuss the reason why they appear to be in use.