This book focuses on the most commonly made grammar mistakes by non-native English speakers. This means that you can set yourself a reasonable target. So rather than trying to learn all English grammar, just concentrate on those issues that tend to be used the most frequently and/or tend to create the most misunderstandings. Each chapter contains: Examples of typical mistakes. Examples of correct usage. Rules / explanations. A short exercise where you can immediately practise what you have learned. Additional exercises. Keys to all exercises. The book also contains a Teachers Introduction. Other books in the series: Top 50 vocabulary mistakes - how to avoid them Wordsearches - widen your vocabulary in English Test your personality - quizzes that are fun and improve your English Word games, riddles and logic tests - boost your English and have fun Jokes - have a laugh and improve your English