This document discusses different aspects of teaching grammar: what grammar is, why we teach it, when to teach it, and how to teach it. Regarding what grammar is, it describes both traditional and functional grammar. For why we teach grammar, it provides historical context as well as current reasons related to language use. When to teach grammar depends on curriculum and student needs. How to teach grammar discusses both grammar translation and communicative approaches, as well as whether grammar is best taught implicitly or explicitly.