Using real student errors from the Longman Learners' Corpus, this dictionary shows students' common mistakes and methods to avoid and correct them. The Longman Dictionary of Common Errors is based entirely on a corpus of genuine students' writing - the Longman Learner's Corpus. This means it gives a true insight into the common errors that students make in their spoken and written work and provides clear and easy-to-use methods to avoid and correct these errors.