This study focuses on the errors in Japanese education regarding the humble languages ‘お+Conjunctive form+する’ for KL. To reduce errors of KL, this study would like to make the following educational recommendations. First of all, in the field of Japanese language education, teachers should make KL understand the concepts and forms of honorific languages. In addition, teachers should pay attention to the mix of honorific languages and Giving-and-receiving expressions. Second, it is difficult to spend a lot of paper on just honorific languages. However, it is desirable to briefly explain important points for learners, such as the importance of form, the inability to add a single-syllable verb, and differences of honorific languages and giving-and-receiving expressions.