We paraphrase all the time, often without thinking about it. Try to give a computer the means to reword a sentence, however, and it becomes apparent that figuring out how to say it differently is complicated.
Read more:http://www.trnmag.com/Stories/2003/120303/Software_paraphrases_sentences_120303.html
Read more:http://www.trnmag.com/Stories/2003/120303/Software_paraphrases_sentences_120303.html