(S (S (BASENP (PRPD Her) (JJ main) (NN concern)) (VP (VBZ is) (SBAR (IN whether) (S (BASENP (DT the) (NN passenger)) (VP (MD will) (VP (VB be) (VP (VBN allowed) (S (VP (TO to) (VP (VP (VB buy) (BASENP (DT the) (NN ticket))) (PP (IN rather) (PP (IN than) (S (VP (VBG being) (VP (VBN fined) (BASENP (NN HK$) (NN 500))))))))))))))))) (PERIOD .))