Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Line by Line

Line by Line: How to Improve Your Own Writing is a classic, and with good reason. If you like words like "gerund" and "prepositional phrase," Line by Line has a lot to offer. Specific instructions on how to tell if a sentence is wordy, for instance, even if you don't have an "ear" for it, include such factors as the ratio of nouns to active verbs, and how many prepositional phrases are used.Examples throughout the book soften, but do not eliminate, the academic style. If you prefer something in plain English, read the excellent Woe Is I, by Patricia T. O'Conner. If you want a serious study-guide for improving your writing, Line by Line is a great choice.