Grammar by Diagram is a book designed for anyone who wishes to improve grammatical understanding and skill. Using traditional sentence diagraming as a visual tool, the book explains how to expand ten basic patterns for simple sentences into compound, complex, and compound-complex sentences, and how to employ verbals (infinitives, gerunds, and participles), other specialized structures, and even punctuation for additional versatility.

The Grammar by Diagram Workbook provides practice exercises to accompany each chapter, including cumulative exercises with which students can check their progress at key points, a summary of concepts for each chapter, and a complete answer key.