Краткое описание: From author: If you can understand this sentence, you already know English grammar. You know all the words intimately; for example, you’ve probably heard or read the word if many thousands of times during your life, and don’t need me to tell you how to use it. What, then, is the point of a book (in English) on English grammar? In a nutshell, to help you to understand all these things that you already know.