Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An excellent book for school and for fun

This book has a wealth of knowledge about a variety of subjects. First of all, it's a great writing source back. It has lots of great tips and suggestions. There's a section on grammar, and it actually uses humor to make it more entertaining. The book is easy to read and the layout is very attractive. This book is useful for both kids and adults, and there's always something you can use in this book. There's a reference section also with lots of useful information.