Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Obscure & Objectionable

This grammar book is not only esoteric (linguistic terms) and obscure, but it also uses sample sentences with the word "booz," drunken state of being, and other unprofessional habits. Tables do not label or display different tenses of the verbs, and the table titles are not even written in English. The author must have been on booz when he selected examples. A pocket guide with tables and patterns would be more helpful than the crazy examples and unclear grammar in this book! This book is not useful for international learners who are attempting to learn the Korean language and make sense out of the grammar. In fact, this book is not even good for any learners.