This document discusses different theories of second language learning, including: 1. Classical conditioning views learning as acquiring new habits through stimulus and response, but learners may revert to their first language due to lack of target language knowledge or for effective communication. 2. The creative view sees language learning as more than habit formation, as learners compare, contrast, make analogies, and are conscious of learning processes. 3. When comparing adult and child second language learners, both have advantages and disadvantages, as adults can reason more effectively but children pronounce better and are not limited to an adult level in the new language.