Whether a second language is learned as a child, teenager, or as an adult, second language acquisition research has noted certain patterns that can help ESL/EFL teachers prepare their lessons. This book explains these issues including the three essential components of ESL/EFL students' learning: input, output, and interaction. Learn how material selection and the roles of age, anxiety, and error correction can improve or challenge a student's ability to learn English. See how all of this can come together to aid your students in dealing with the complexity of learning a second language.