(S (S (BASENP (NN Oil) (NNS prices)) (VP (VP (VP (VBD attained) (BASENP (DT a) (JJ six-month) (NN high))) (PP (IN on) (BASENP (NNP Friday)))) (COMMA ,) (PP (IN on) (NP (BASENP (JJ new) (NNS signs)) (SBAR (IN that) (S (BASENP (DT the) (NNP U.S.) (NN economy)) (VP (VP (MD may) (RB not)) (VP (VB be) (VP (VBG contracting) (ADVP (ADVP (ADVP (RB as) (RB fast)) (IN as)) (S (VP (VBD was) (VP (VBN believed)))))))))))))) (PERIOD .))