(S (S (PP (IN Before) (NP (BASENP (DT the) (NN signing)) (PP (IN of) (BASENP (DT the) (NN agreement))))) (COMMA ,) (S (BASENP (NNP China)) (VP (VBD allowed) (S (NP (RB only) (NP (BASENP (NNS students)) (CC and) (NP (BASENP (NNS people)) (PP (IN on) (BASENP (NN business) (NNS trips)))))) (VP (TO to) (VP (VB visit) (BASENP (DT the) (NN country)))))))) (PERIOD .))