1. A method that converts a classifier in a host language to a classifier in a target language, the method comprising: marking target language examples of passages of text in order to obtain an initial classifier in the target language; re-classifying a plurality of target language examples in the initial classifier; questioning the marking used to obtain the initial classifier, the questioning being based on the re-classifying; isolating a high-quality set of target examples based on the results of the questioning; and using the high-quality set of target examples to prepare a high-quality classifier in the target language.