Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The best, so far!

If you are serious about learning the English language as a non-native learner, you'll enjoy this book. It covers the subject thoroughly, with a more practical approach than others. I think this book is the best because you learn phrasal verbs in contest, as they are used everyday. An academic approach can be misleading, and useless, for the non-native learner. The approach is very user-friendly, and intuitive. Very good for intermediate and advanced learners.