(S (S (ADVP (RB Previously)) (COMMA ,) (S (BASENP (NNP China)) (VP (VBZ has) (VP (VBN opposed) (NP (NP (BASENP (NN two) (NNS attempts)) (PP (IN at) (BASENP (NNP United) (NNPS Nations) (NNP Security) (NNP Council) (NNS resolutions)))) (S (S (VP (TO to) (VP (VB control) (NP (BASENP (DT the) (NN violence)) (PP (IN in) (BASENP (NNP Syria))))))) (CC and) (S (VP (TO to) (VP (VB ask) (SBAR (IN for) (S (BASENP (NNP President) (NNP Bashar) (NNP al-Assad)) (VP (TO to) (VP (VB resign)))))))))))))) (PERIOD .))