This document discusses teaching English to students learning English as an additional language. It defines who English language learners are and emphasizes the importance of understanding students' socio-cultural backgrounds. Theories on first and second language acquisition are examined, including behavioral, innatist and interactionist perspectives. Stages of second language development and implications for instruction are also outlined. The document stresses the need for explicit instruction, modeling, practice and support for English language learners that is differentiated from teaching English as a first language.