The current study aims to investigate advantages and limitations of using AI-based chatbots in English classes. We propose that the followings are pivotal functions of educational chatbots: voice recognition accuracy, providing feedback, employing meaning negotiation strategies, interests, and Learning Management System. An AI-based chatbot, EBS PengTalk, was employed and the features were analysed. In addition, two surveys were conducted with a student group and a teacher group. The results show that EBS PengTalk has weaknesses in those five functions although voice recognition was reported rather satisfactory. It turned out that students were discouraged to talk to PengTalk because responses and feedbacks from PengTalk were prefabricated and limited with several demotivating features. It also turned out that PengTalk is inadequate to initiate self-directed learning. Thus, in developing educational chatbots, careful consideration should be given to users, teachers and students, not only chatbot features.
II. 이론적 배경