If your teen needs a major overhaul on his punctuation skills, try Jensen's Punctuation. With only a few minutes a day, Jensen's Punctuation teaches and gives plenty of practice of the five basic rules that cover 75-90% of punctuation errors in writing. Systematic and easy to master, Jensen's Punctuation covers all aspects of punctuation and it contains all rules for every punctuation mark from the period to the dash. Everything is included: rules, examples, explanations, exercises, a final test, answers, teacher helps and an index. This book is best used after Jensen's Grammar.