In order to write good and perfect English, a good understanding of grammar, sentence formation and thoughts is a must. This book is a guide on very common mistakes frequently committed in the course of writing and speaking English language, both at personal and professional level. This book is highly useful for students and professionals alike. It is a must read for all those who are interested in speaking and writing good and perfect English. An Extrmely Useful Book for all English Learners and Aspirants of Various Competiting Exams.