(S (S (BASENP (EX There)) (VP (VBZ is) (NP (BASENP (DT a) (NN probability)) (SBAR (IN that) (S (BASENP (PRPD his) (NNS hands)) (VP (MD may) (VP (VB have) (S (VP (TO to) (VP (VB be) (VP (VBN amputated)))))))))))) (PERIOD .))