This study aims to develop instructional methods for balancing the teaching of “Accuracy” and “Appropriacy” in the “English Logic and Expression II” lesson. Recognizing the author’s problem of an emphasis on “accuracy” instruction with insufficient focus on “appropriacy,” the study leverages the English proofreading AI, “DeepL Write,” to reduce the instructional time on “accuracy.” Additionally, by conducting a second writing session with a different audience after the first writing session under the same theme, the study guides the “appropriacy” of English writing through the process of adjusting the text based on the audience. The study compares two types of student products and analyzes the changes observed before and after, specifically focusing on “appropriacy.” The results suggest that the effective instruction of “appropriacy” can be achieved through the utilization of AI. However, the study also highlights the need for further qualitative improvement in the instructional approach to “accuracy.”