This is a workbook for the Longman Dictionary of Common Errors and has been designed to help students avoid the errors most frequently made by learners of English. The book focuses on important points of usage and gives students practice in getting them right and contains 50 write-in exercises. A full answer key is included and every answer has a cross reference to an explanation in the Longman Dictionary of Common Errors. This workbook is intended for use both in the classroom and for self study.