This book explores how English grammar enables speakers and writers to represent the world, to interact with one another, and to create coherent messages. This book provides second language teachers with a functional description of English grammar, in which grammar is viewed as a communicative resource. Each chapter includes a focus on areas of difficulty for second language learners, numerous authentic examples, tasks that allow the reader to apply the concepts introduced, and discussion questions. A final chapter covers issues in the learning and teaching of grammar, and reviews methodological options for the second or foreign language classroom. Assuming no previous study of linguistics or English grammar, this book is suitable for self-study or as a textbook in teacher education programs.