Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good study book for spoken Chinese

This is a good grammar text book for spoken Mandarin Chinese. It gives lots of examples, drills and grammar explanations in its twenty lessons. It uses an outmoded phonetic spelling system developed during WWII by Yale University which is similar to the the widespread Pin Yin phonetic spelling. This Yale romanization is actually designed for the English tongue, so it seems more natural to pronounce than Pin Yin, but since not many places teach it, it's of limited use.