Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Simple Grammar Instruction

A very good no-frills book that is an instant cure for all sorts of grammar problems. Don't expect the flashy, "cute" approach that many modern grammar books have adopted, but rather just sit back and enjoy a straightforward no-nonsense approach to grammar that is understandable to even the most hardened grammarphobe. A great read for those interested in grammar or those wishing to polish up their everyday speech and writing.