The document discusses several methods for teaching second languages:
1) The Grammar-Translation Method focuses on translating texts and learning grammar rules but does not emphasize speaking practice.
2) The Direct Method uses only the target language and encourages oral production through activities like question-answering. However, it does not adequately structure materials.
3) The Audio-lingual Method relies on mimicry, memorization of phrases, and repetitive drills with an emphasis on pronunciation but no grammar explanations.
4) Communicative Language Teaching is learner-centered and focuses on using language in real-life social contexts for communication rather than just grammar rules.