The purpose of this study is to design a Japanese language class based on the analysis of college students’ assignments and their misuses of ‘can’ expressions in them during a Japanese conversation class. In the class, the assignments required the students to record their thoughts about conversation topics. For the assignments, the instructor tried to transcribe the students’ recordings, find their misuses of ‘can’ expressions and provide some corrective feedback for the misuses. Following the feedback, the students were asked to resubmit their recordings and then, the instructor examined their recordings again focusing on ‘can’ expressions. The findings from the students’ first recordings revealed that the students used some verbs that describe ‘possibility’ at first, and gradually they used more ‘surukotogadekiru(=can)’ expressions. Then, finally, the students tended to use both ‘possibility’ verbs and ‘surukotogadekiru(=can)’ expressions regardless of the students’ proficiency levels. However, by comparing to the students’ second recordings, the use of ‘possibility’ verbs increased while the use of ‘surukotogadekiru(=can)’ expressions decreased in the second recordings. Based on the findings, a class design that can be applicable to the Japanese language conversation classes was suggested.