Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A real treasure!

I have been a professional writer for nearly 20 years now, and found myself (for the first time ever) actually laughing out loud while reading a grammar book. O'Conner has written a book that takes the drudgery out of grammar, and infuses it instead with much needed wit and useful wisdom. Never insulting to the intelligence, she simply tells it like it is-in plain English. I just cannot express enough how useful and effortless this book is. It is for every one: writer, butcher, baker, candlestick maker. Get it, read it, and you will at last master that mighty foe that has plagued us all at one time or another.A former New York Times Book Review editor, Patricia T. O'Conner is not just an excellent copy editor (worth their weight in gold to any writer), she has proven herself a smashing good writer!