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This research explores the language dynamics employed by English teachers at MAN Pangkep Senior High School during instruction, focusing on the languages used and the rationale behind their choices. Employing a qualitative approach, the study involved interviews and classroom observations, with data analysis encompassing reduction, interpretation, presentation, and conclusion-drawing. The findings reveal that teachers utilize three languages: Bugis, Indonesian, and English, with the choice largely influenced by the students' needs. Bugis, being the students' mother tongue, is frequently used to enhance comprehension, particularly for those struggling with Indonesian and English. Although Indonesian is still significant, Bugis often facilitates easier learning, as teaching solely in English proves challenging for many students. To support effective trilingual instruction, the study recommends regular training in multilingual teaching methods for teachers. Additionally, establishing mentorship programs where more proficient teachers guide their peers could further bolster trilingual capabilities across the school. Such initiatives are essential for improving instructional practices and enhancing overall student understanding in a multilingual educational environment.

Language of Instruction, English Teacher, Student Linguistic Diversity, Multilingual Teaching Methods