Instruct: Classify Amazon reviews into positive or negative sentiment
Query: haven't stumped it yet

We've had a copy of Grammar for Grownups in our communications/publications office for about a year now, and we have yet to have a question that has "stumped" this book! We find absolutely everything in it...it's great. And the descriptions and explanations are wonderful....and funny! ie: "Yes, grammar (like sex) holds out the challenge to do it well." "Chapter 3 Do/Be/Do/Be/Do". For those who still want drill, each chapter has exercises at the end....with answers given. The ultimate? People from neighboring offices are now asking us to "Look in that book of yours for xxx." How's that for a reputation?