(S (S (S (BASENP (NNP Chicago) (NNS residents)) (VP (VBP have) (VP (VBN expressed) (NP (BASENP (NNS concern)) (PP (IN over) (SBAR (WHNP (WP what)) (S (VP (MD would) (VP (VB occur)))))))))) (SBAR (IN if) (S (BASENP (NNP Winfrey)) (VP (VBD were) (S (VP (TO to) (VP (VB leave)))))))) (PERIOD .))