Book excerpt: Good grammar is essential for effective communication. Yet many of us are plagued by the same nagging question: If I'm so smart why does grammar make me feel so dumb? Grammar For Smart People can help. Here at last, is a lively, user-friendly guide that zeroes in on the areas that give everyone the most trouble, and it does it with an advantage most grammar books lack - a light touch. You won't feel as though you're back in the fifth grade, diagramming sentences and struggling with a grammar textbook filled with dull, unbreakable rules.