This book is not an ordinary grammar book that gives you a detailed description of each grammatical item in a traditional way and it is, on the other hand, a major reference book on common errors for learners and teachers of English as second or foreign language. The book primarily deals with common errors in English and all the errors in the book have been corrected by providing appropriate explanations. As the book is exclusively designed for students and scholars in India and abroad, writer has taken into consideration the realities and challenges of national as well as international life while preparing the examples in the book. Moreover, the language used in the book is very simple, natural and lively. It provides the learner with an opportunity for understanding the subject independently and working out the problems (errors) by himself. In this book, the subject-matter is presented in forty six chapters with five sections. Each chapter in the book begins with an introduction and provides a large number of explanations followed by numerous errors with their corrected versions. At the end of each chapter, great deals of exercises have been given for the learner's practice. In the second section, writer explained the various parts of speech very briefly and in the third section, a complete key to all the exercises in the book has been provided. In the fourth section, some of the university questions on common errors with answers have been given. The fifth section of the book contains one thousand miscellaneous common errors with answers.