(S (S (BASENP (DT A) (JJ Chinese) (NN scholar)) (VP (VBD warned) (SBAR (IN that) (S (BASENP (DT the) (NN situation)) (VP (MD could) (VP (VB become) (VP (QT (DQL ``) (VP (ADVP (RB further)) (VBN aggravated)) (DQR '')) (PP (IN by) (NP (BASENP (NNP Saturday) (POS 's)) (BASENP (JJ planned) (NN event))))))))))) (PERIOD .))