Objectives The purpose of this paper is to propose an online teaching method to help learn “Modality” expressions of System Functional Linguistics (SFL).
 Methods We introduce the SFL terms “coherent realization,” “incongruent realization (grammatical metaphor),” and “systemic network of modality,” which is the entire system of modality. These three concepts from the SFL literature serve as the principles for analyzing and teaching the modality categories of Korean in this paper, and as the practical research methodology for constructing the online program manual in Chapters 4 and 5. Therefore, this paper takes the method of literature review, i.e., applying the principles of the literature to an online education program. “Out-of-video” learning is an essential factor in achieving learners' self-directed learning activities in online non-face-to-face classes. To be specific, the ‘out-of-video’ class is conducted in two stages. First, the ‘AI-tutor- preparation’ stage is subdivided into five sub-stages of activities. They are the knowledge activation stage, the interactive reading stage, the comprehension test stage, the dictation stage, and the role play stage. The paper is organized around the target sentences extracted from the masterpiece fairy tale. The “Review Activities and Feedback” stage is the stage where the students perform extended activities centered on the characters learned in this paper. To achieve this purpose, this paper uses Oscar Wilde's “The Happy Prince” as a teaching medium to make learners' basic knowledge and information more interesting.
 Results As a result of exploring teaching methods for advanced learners to learn ‘Modality expression’, it was confirmed that the lexico-grammatical realization of, Modality and the grammatical-metaphor of Modality can be distinguished and the Values (high, middle, and low) can be identified according to the type of Modality such as probability, usuality, obligation, and inclination. In addition, the online class system of repeatedly practicing target texts enables holistic learning in the areas of reading, listening, speaking, and writing necessary for language education, and online learning outcomes can usually be assessed immediately. However, in the case of writing activities, it was confirmed that the learning effect can be maximized only when the teacher's periodic feedback is actively conducted.
 Conclusions The significance of this paper is that we have proposed a practical teaching method that departs from the theory-infused teaching method of SFL. In other words, we have provided an alternative way for learners who are not SFL majors to engage with the SFL curriculum through the above online approach.
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