a spirit that can not be denied 
(ROOT (NP (NP (DT a) (NN spirit)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN denied))))))))
(ROOT (NP (NP (DT ) (NN )) (SBAR (WHNP (WDT )) (S (VP (MD ) (RB ) (VP (VB ) (VP (VBN ))))))))