This document discusses several theories related to language acquisition and language learning. It covers:
1) The differences between language acquisition, which is subconscious and occurs with massive exposure at a young age, versus language learning, which is conscious and involves formal instruction.
2) Behaviorism theory which views learning as the result of stimulus, response, and reinforcement.
3) The theory that language learning will take care of itself if learners are involved in meaningful communication.
4) The debate around focus on form versus focus on forms approaches to language teaching.