This study examines the use of Mandarin, Taiwanese, and English in two Freshman English classrooms in a university in southern Taiwan. With a varied language history, several languages are spoken in Taiwan. Although there are monolingual speakers of either Taiwanese or Mandarin, the majority of people in Taiwan are bilingual or trilingual. Therefore, code-switching often occurs in peoples daily conversation. Just as languages are used in speakers daily communication, so it is in the classroom context. The three aims of this study are firstly to explore the nature of classroom talk, focusing...