In this paper, I conducted a comparative analysis on the difference in perception of the naturalness of "passive verb + tearul" syntax in both Japanese and Korean languages, and the following results were obtained.[1] It was confirmed that the degree of naturalness of the "passive verb + tearul" structure observed 　　by Korean Japanese learners was lower than that of Japanese native speakers. In addition, the degree of naturalness with each type indicates the highest score for Type B, followed by Type A and Type C, respectively.[2] In the case of Japanese native speakers, the degree of naturalness tended to be higher as the place nouns appeared above the sentence. But Such trends were not apparent for Korean learners of Japanese.[3] In the case of Korean learners of Japanese., the degree of naturalness was much higher when the target verb variant was used as the predicate, and the order of the placement verb, target unchanged verb, and physical verb verb .[4] It was found that the results of the judgments of naturalness differ greatly between a person who specialized in Japanese Studies and a person who is not specialized in Japanese Studies.