(S (S (NP (BASENP (DT The) (NNS protests)) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBD began) (PP (IN in) (BASENP (NNP Lhasa)))))) (COMMA ,))) (VP (VBP have) (VP (ADVP (RB since)) (VP (VBN spread) (PP (TO to) (BASENP (JJ neighboring) (NNS provinces))))))) (PERIOD .))