The world's best-selling grammar series for learners of English.Basic Grammar in Use Fourth Edition is an American English, self-study reference and practice book for elementary level learners (A1-B1). It is a book that has been used by millions of people around the world to improve their English. With simple explanations, clear examples and easy to understand exercises, it is perfect for students who are studying on their own, but can also be used in the classroom. This fourth edition is available as an ebook as well as a printed book. The ebook works on PCs, Macs, iPads and Android tablets. It has the same grammar explanations and exercises found in the printed book, plus other great features such as audio for all of the example sentences and an easy-to-use answer key.