(S (S (PP (IN In) (NP (BASENP (NN spite)) (PP (IN of) (S (BASENP (DT all) (JJ departmental) (NNS prefects)) (VP (VBG being) (VP (VBN authorised) (S (VP (TO to) (VP (VB impose) (BASENP (NNS curfews))))))))))) (COMMA ,) (S (PP (IN in) (BASENP (NN practice))) (S (BASENP (RB only) (JJ few)) (VP (VBP have))))) (PERIOD .))