This article explores the semantic and structural significance of word order in Modern English, emphasizing its role as a grammatical and communicative device. The paper traces the historical evolution of English word order from Old and Middle English to Modern English, highlighting how the loss of inflectional endings increased the reliance on syntactic arrangement to express grammatical relations. It also examines the functional factors influencing word order variation—such as information load, focus, and communicative intent—and discusses grammatical transformations like inversion, fronting, dislocation, and cleft constructions. The study concludes that English word order functions not only as a structural component but also as a semantic organizer that contributes to meaning and emphasis in communication. Keywords: word order, syntax, semantics, sentence structure, Modern English, grammatical expression, information structure