Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A fantastic reference book

Everytime I am confused about an element of Japanese grammar I consult this reference book and I always walk away satisfied with all my questions answered. The translations are fantastic, the example sentences are chosen to clearly demonstrate the grammar point, and different usages are explained. What I like most is that this book takes varying English translations of the grammar point and shows how they are conceptually connected, so that you only have to remember the one grammar point rather than memorizing a bunch of seemingly different English translations.I hope to be a Japanese teacher in the future, and I'll be keeping this book by my side at all times.