− it was pathetic the worst part was the boxing scenes − no plot twists or great scenes + and satire and great plot twists + great scenes great film After per-document binarization: A second important addition commonly made when doing text classification for sentiment is to deal with negation. Consider the difference between I really like this movie (positive) and I didn't like this movie (negative). The negation expressed by didn't completely alters the inferences we draw from the predicate like. Similarly, negation can modify a negative word to produce a positive review (don't dismiss this film, doesn't let us get bored).