Lousy Grammar Book

I was handed from ELITE school a correction list for the new Grammar I textbook. Gee, I was so flabbergasted that the writer had made so many mistakes (four pages). On top of that, however, students from two classes of mine have already finished the lessons, and now I have no idea how to make up for them who have received some wrong grammar clips from me. I think I already commented on this doggone grammar book in the first place, and the school shouldn't have changed to this book. The die is cast, what can I say?