Abstract
This study focuses on pairs of transitive and intransitive verbs in Japanese grammar learning, particularly examining those that are morphologically indistinguishable. Among Japanese transitive and intransitive verbs, some have the suffix pattern "u-eru" while others have "eru-u," making them difficult to distinguish. Based on previous research, these verbs are classified as internal change type and external change type, respectively, with explicit explanations provided for learners. Utilizing corpus data, the study investigates usage differences by analyzing frequently co-occurring nouns and adverbs. It was found that intransitive verbs tend to retain their essential meanings, while transitive verbs often exhibit derived uses. Based on these findings, a step-by-step teaching method for beginner, intermediate, and advanced levels is proposed.
