Instruct: Classify an Amazon review into positive or negative sentiment.
Query: this is a great movie IF ...

you'll love this dvd IF you want to see a bunch of under-age kids who are constantly strung out on drugs, use the F word at least three times in every sentence they utter, have illicit sex in every other scene, and thrive on violence as if it were commonplace ... not to mention the most naive parents ever seen on film.