"Top 20" focuses students on mastering 20 essential English grammar points. Exercises draw students' attention to common grammatical errors then teach various ways to edit and make corrections. "Top 20" can be used in writing classes with any text, such as Great Paragraphs (page 12), Great Essays (page 12), Blueprints 1, Blueprints 2 (page 14), HMEAS College Writing 1-4 (page 9), or as a stand-alone text for a grammar or writing class.