The English Grammar Workbook for Grades 6, 7, and 8

The format and design of this book is awesome. I borrowed it from the library and skimmed through it. Saddened by the fact that someone has written in, I was debating buying a copy. Going to online shops, I was astonished to see many people give examples of errors in the key! Many examples of adjectives are called nouns and so forth. Ugh. I will have to pass on this one. If it was properly edited it has so much potential.