1. A computing device for determining an opinion expressed via target words, the device comprising an opinion data store that specifies sequences of parts of speech that may express an opinion, a probability that each sequence contains a word that may express an opinion, and a probability that each word expresses an opinion; and an infer opinion component that includes a component that calculates a probability that the target words contain sequences specified in the opinion data store; a component that retrieves from the opinion data store the probability that the sequences of the target words contain a word that may express an opinion; a component that retrieves from the opinion data store the probability that the words of the target words may express an opinion; and a component that selects an opinion for the target words based on a combination of the probabilities.