Kim, Choong Bae. 2002. Applications of the Historical Background of the English Language to English Teaching and Learning. The History of English, 14. The aim of this paper is to show that many of the apparent irregularities of English, which are difficult to explain, can be explained from a historical perspective. The paper provides various examples in which the historical development neatly explains the irregularities and anomalies with respect to spelling-to-sound correspondences, silent letters, alternations, and morphological paradigms. The following phenomena are discussed in detail: the Great Vowel Shift, the lengthening and shortening of vowels, laxing, unrounding, the leveling of unstressed vowels, schwa loss, mutation, fricative voicing, etymological respelling, consonant cluster simplification, voiced fricative allophones' becoming phonemes, assibilation, analogy, modern survivals of case and number, the loss of second person singular pronoun and the survival of 'em, the development of the neuter instrumental demonstrative, weak and strong verbs, and suppletion. It is suggested that the history of the English language is an important and instructive subject for English teachers and that they should be aware of the possible pedagogical benefits of incorporating historical explanations into their teaching.