The document provides definitions, principles, and activities for four language skills: reading, writing, speaking, and listening. For reading, it defines reading as a complex skill involving various component operations. It emphasizes giving students time for extensive and sustained silent reading. For writing, it notes that writing involves putting letters together to form words, phrases, and sentences. It recommends sharing writing with other students to add authenticity. For speaking, it defines speaking as constructing and delivering understandable messages using correct pronunciation and intonation. It stresses including techniques to help students perceive and use language blocks. For listening, it defines listening as understanding not just words but also speaker's meanings, and as a reciprocal skill. It recommends using authentic tasks so students see