I used this book to teach a basic grammar class. I wanted to use something less formal than the average textbook, but unfortunately, this book had too many errors and confusing passages to make it work.The book has several errors. Not only are there problems in punctuation and grammar, but also many of the answer keys for the various exercises have blatantly wrong answers. More than once I found myself frustrated in class because an example proved to be inaccurate or an exercise had wrong answers.There are also many confusing passages. Some of the passages sound like the rattlings of a grammarian that help little for the so-called English "idiot."Between the many mistakes and the confusing passages, I don't see how the book can be of much use for those who might stuggle with grammar issues. There are many better books out there.