This document discusses the key concepts and theories that have influenced the development of school-based English language teaching. It describes how the behaviorist theory led to drill and practice methods, while the cognitive theory emphasized internal mental processes and developed more interactive approaches like communicative language teaching. The constructivist theory encouraged learner-centered approaches like task-based learning by having students construct their own understanding. The sociocultural theory developed more socioculturally responsive methods such as content and language integrated learning. Technological advancements also contributed to blended learning and online language learning approaches. The concepts and theories underlying English language teaching have evolved significantly over time.