This document discusses the power and implications of generative-transformational grammar for teaching English as a second language. It notes that this grammar can generate an infinite number of well-formed syntactic structures using a finite set of rules. While some criticize it as too complex for language teaching, the document argues it can guide curriculum development by revealing how sentences are structurally related. It suggests teaching simple kernel sentences first before more complex forms, and provides examples of phrase structure rules and exercises teachers could use to help students learn how to generate grammatical utterances step-by-step.