An essential guide to grammar specifically designed for teachers of English which can be used as a course book, or a reference work. This practical volume focuses on the topics which are essential skills for language learners and which teachers need to understand to be professionally competent. It gives exercises, and learner error information to guide teachers in teaching and assessing grammar learning. This book is designed to help teachers of English develop an understanding of the aspects of English which are essentially relevant for learners who speak other languages. Using corpus research, Kennedy cuts to the heart of what is important in the teaching of English grammar.