(S (S (BASENP (JJ Iranian) (NNS officials)) (VP (VBP have) (VP (VBN said) (SBAR (IN that) (S (BASENP (NNP Iran)) (VP (MD will) (VP (VB respond) (PP (IN by) (S (VP (VP (VBG downgrading) (NP (BASENP (PRPD its) (NN cooperation)) (PP (IN with) (BASENP (DT the) (NNP IAEA))))) (CC and) (VP (VBG resuming) (BASENP (JJ full) (NN scale) (NN fuel) (NN enrichment))))))))))))) (PERIOD .))