English, sometimes described as the first global lingua franca, is the dominant international language in communications, science, business, aviation, entertainment, radio and diplomacy. While English is not an official language in most countries, it is currently the language most often taught as a second language around the World. Proficiency to speak and write in English is very important to succeed in any field of life in the modern world and will be more important in the future. The present book is a comprehensible work aims to help those who want to master in English. It helps people to understand the importance of grammar, the correct spelling for words that people most commonly mistaken for. With this book, they also learn how to speak and write better in English. Correct usage of words in writing and speech is also explained. This book will be suitable for everyone regardless of age, race, nationality and culture.