This document outlines the theoretical and methodological approaches in English linguistics, emphasizing the importance of linguistic theories in understanding language structure, meaning, and communication. It discusses various linguistic areas including grammar, semantics, cognitive linguistics, psycholinguistics, pragmatics, sociolinguistics, and historical linguistics, tracing their development from the 19th century to contemporary theories. Key figures like Ferdinand de Saussure are highlighted for their contributions that shaped modern linguistic thought, particularly the idea that language is a relational system of signs defined by differences rather than inherent qualities.