(S (S (BASENP (NNP Ambassador) (NNP Crocker)) (VP (VBD said) (SBAR (IN that) (S (SBAR (IN while) (S (BASENP (PRP he)) (VP (QTL (DQL ``) (VP (MD can) (RB not))) (VP (VB guarantee) (NP (QTR (BASENP (NN success)) (DQR '')) (PP (IN in) (BASENP (NNP Iraq)))))))) (COMMA ,) (S (S (VP (VP (VBG withdrawing) (ADVP (RB completely))) (ADVP (RB now)))) (VP (MD would) (VP (VB result) (PP (IN in) (BASENP (NN failure)))))))))) (PERIOD .))