This workbook, for grades four through six, offers a humorous slant on the subject of grammar through comical examples of incorrect usage, in addition to exercises with a logic twist. The workbook teaches basic rules of language mechanics and reinforces the rules by showing the logic behind them. The book gives instruction, examples, and practice on specific rules of grammar, punctuation, capitalization, usage, vocabulary, and spelling. Each rule is presented as a lesson with three parts: an introduction to the rule; Your Turn exercises; and Challenge exercises. After an introduction which outlines the purpose of the book and provides teacher help, the units are: Capitalization; Run-ons and Fragments; Pronouns; Modifiers; Verbs; Agreement; Unnecessary Words; Punctuation; Friendly Letter; and Spelling and Vocabulary. A "Teacher Help" section contains: Preparing the Lesson; Presenting the Lesson; Unit Notes; and Practice Answers. Also included are a 72-item glossary and an answer key. (PM)