(S (S (S (BASENP (DT The) (NNP United) (NNPS States)) (VP (VP (VBZ denies) (SBAR (IN that) (S (BASENP (NNP Habib)) (VP (VBD was) (VP (VBN tortured)))))) (PP (IN with) (BASENP (PRPD their) (NN knowledge))))) (COMMA ,) (SBAR (IN although) (S (BASENP (NNP US) (NNS officials)) (VP (VP (VP (VBD were) (RB not)) (ADJP (JJ present) (PP (IN during) (BASENP (PRPD his) (JJ overseas) (NN captivity))))) (CC and) (VP (VP (MD could) (RB not)) (VP (VB guarantee) (SBAR (IN that) (S (BASENP (PRP he)) (VP (VP (VBD had) (RB not)) (VP (VBN been) (VP (VBN tortured)))))))))))) (PERIOD .))