Where does a comma go? Why is this a run-on? This guided workbook helps high school and college students improve their ability to proofread for grammar and punctuation errors. This workbook, written by a popular college professor, contains classroom tested exercises designed to improve your abilty to spot errors in writing the way no other workbook does. The explanations are clear and interesting, and there are tips for better studying, too. At the end of this workbook, you will be a better proofreader, and it will show in all the writing you do.