By Anne Stilman ISBN 0-89879-776-4; $19.99; 352 pages; Paperback In a world where clarity reigns supreme, your writing must be smooth, clear and as graceful as it is concise. Fortunately, being grammatically correct needn't be difficult. Grammatically Correct: The Writer's Essential Guide to Punctuation, Spelling, Style, Usage and Grammar is easy to use; it presents information in a way that is easy to access; and, most of all, it's comprehensive. You can master: Puctuation - Learn how the use - and misuse -of punctuation can affect the clarity and tone of your work. Spelling - Learn why, even with computerized spell-checkers, writers still must know the rules of spelling, hyphenation and capitalization. Structure -Learn how to make sentences flow more logically and how to keep writing concise. Style - Discover ways to avoid wordiness, clumsiness and poor organization Usage - Delve into issues such as active vs. passive voice Grammar - Learn to avoid frequent stumbling blocks. Grammatically Correct offers practical instruction and exercises, and examples that show how incorrect usage can alter your meaning. It not only covers writing rules, but also advises you on developing a smooth and graceful style. Use Grammatically Correct and you'll go beyond the mechanics: You'll learn how to write well.