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1. 1. Understanding Second Language Acquisition

   

   This accessible textbook provides a concise, balanced overview of second language acquisition research and theory, explaining core concepts such as input, interaction, output, interlanguage development, and the roles of cognition and sociocultural context. It reviews key debates (e.g., nativist vs. usage-based accounts), examines individual differences (age, aptitude, motivation), summarizes evidence on the effects of instruction and classroom practice, and outlines research methods and implications for language teaching and future research.

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