ABSTRACT Kusuma Ningsih, Irwanda. 2024. “The Effectiveness of Character AI as Learning Media in Enhancing EFL Students' Sentence Structure at SMP Negeri 3 Magelangâ€. Undergraduate Thesis. English Education Department. Faculty of Education and Teacher Training. Universitas Tidar. Advisor I Dr. Farikah, M.Pd., Advisor II Boris Ramadhika, M.Pd. Keywords: Effectiveness, Artificial I…