This document discusses non-verbal communication and its importance in the English language teaching (ELT) classroom. It begins by defining non-verbal communication as communication through non-linguistic cues such as facial expressions and gestures. It then describes the various forms of non-verbal communication, including kinesics, proxemics, paralanguage, and physical appearance. Next, it explains the functions of non-verbal communication in complementing, regulating and contradicting verbal messages. The document concludes by discussing the principles of non-verbal communication and emphasizing the importance of teachers' non-verbal behaviors in creating a motivating environment for language learning in the classroom.