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This book, although, is small compared with some enormous dictionaries of grammar, covers the most practical, formal and informal grammars of English. So, if you want to upgrade your English in a short period of about one month or more, it really helps you. For example me, before i'd read this book, my English was under zero (deeply weak!) but now i can right use English. So i recommend this book to everybody wants to have a preparing on English before referring to grammar dictionaries.