(S (S (BASENP (DT That) (NN year)) (COMMA ,) (S (BASENP (DT a) (NN flu) (NN epidemic)) (VP (VBD forced) (S (BASENP (DT the) (NNS finals)) (VP (TO to) (VP (VB be) (VP (VBN called) (PRT (RP off))))))))) (PERIOD .))