(S (S (BASENP (JJ Former) (NNP Federal) (NNP Reserve) (NN chief) (NNP Alan) (NNP Greenspan)) (VP (VP (VBD said) (BASENP (RBR earlier) (DT this) (NN week))) (SBAR (IN that) (S (S (BASENP (NN housing) (NNS prices)) (VP (MD may) (VP (VB fall) (PP (IN by) (QT (DQL ``) (BASENP (JJ double) (NNS digits)) (DQR '')))))) (SBAR (IN as) (S (BASENP (DT the) (NN subprime) (NN crisis)) (VP (VP (VBZ bites) (ADVP (RBR harder))) (COMMA ,) (S (VP (VBG prompting) (S (BASENP (NNS households)) (VP (TO to) (VP (VP (VP (VB cut) (PRT (RP back))) (ADVP (RB sharply))) (PP (IN on) (BASENP (NN spending))))))))))))))) (PERIOD .))