Our eBook price $11 is 26% off (paperback retail $14.95). No additional charges. Downloadable content is non-returnable. This book takes you through the first 8 chapters of The First Whole Book of Diagrams. It is a workbook of the slightly more elementary version of it, designed to complement it especially for those new to diagramming. It does include an answer key for the exercises in the worktext. It does provide enough sentences to see if the student understands the material. Begins with two word sentences and progresses to poems, proverbs and more! Great addition to any grammar curriculum.