(S (S (NP (BASENP (DT The) (NN number) (NN one) (JJ U.S.) (NN commander)) (PP (IN in) (BASENP (NNP Iraq)))) (VP (VBD said) (SBAR (S (BASENP (NN 30,000) (NNP United) (NNPS States) (NNS troops)) (VP (MD may) (VP (VB be) (ADJP (JJ able) (S (VP (TO to) (VP (VP (VB leave) (BASENP (NNP Iraq))) (PP (IN by) (NP (BASENP (DT the) (NN summer)) (PP (IN of) (BASENP (NN 2008))))))))))))))) (PERIOD .))