This document discusses the evolution of linguistic theories from structuralism to generative grammar. It covers European structuralism developed by Saussure, American structuralism developed by Bloomfield which took a behaviorist approach, and Chomsky's theory of generative grammar which posited an innate linguistic competence and separated competence from performance. The key aspects of each theory are outlined, including Saussure's dichotomies, Bloomfield's view of language as stimulus-response patterns, and Chomsky's idea that language involves generating novel sentences based on internalized rules.