Correct grammar is more than a set of conventionally accepted rules; it's a reflection of clear thinking. Here are the rules of English grammar with insights into their underlying logic. For many years, Barron's Pocket Guides have served high school and college students, as well as business professionals and others, as reliable fast-reference books filled with easy-to-locate information pertaining to all practical aspects of language use. The new editions are attractively designed and printed in two-color type, and serve as especially useful books for the home, school, or business reference bookshelf.