1. A computer-implemented method for determining whether to apply a given paraphrase alternation pattern to an input string, the method comprising: generating a context model based on a data set from which the given paraphrase alternation pattern was derived, the data set being database of news articles; utilizing a computer processor that is a functional component of the computer to apply the context model to determine whether the given paraphrase alternation pattern can be applied to the input string so as to preserve meaning; if it is determined that the given paraphrase alternation pattern can be applied so as to preserve meaning, then applying the given paraphrase alternation pattern to the input string, wherein the given paraphrase alternation pattern indicates a pattern of transformation from a first set of words to a second set of words, and wherein applying the given paraphrase alternation pattern comprises transitioning the input string from the first set of words to the second set of words, and wherein applying the given paraphrase alternation pattern further comprises applying the given paraphrase alternation pattern to the input string in a plurality of different ways to produce a plurality of different textual variations, and then applying the language model to the plurality of different textual variations to determine a probable sequence of words.