Corpus-Based Approaches to ELT presents a compilation of research exploring different ways to apply corpus-based and corpus-informed approaches to English language teaching. Starting with an overview of research in the field of corpus linguistics and language teaching, various scenarios including academic and professional settings, as well as English as International Language, are described. Corpus-Based Approaches to ELT goes on to put forward several chapters focusing on error analysis using learner corpora and comparable native speaker corpora. Some of these chapters use translations and their original sources, while others compare the production of learners from different L1 in multilingual learner corpora. Also presented are new tools for corpus processing: a query program for parallel corpora, and the provision of tools to implement pedagogical annotation. The last section discuss the challenges and opportunities that multilayered and multimodal corpora may pose to corpus linguistic investigation. This book will be indispensible to those teaching in higher education and wishing to develop corpus-based approaches, as well as researchers in the field of English Language Teaching.