she fails to provoke them . 
(ROOT (S (NP (PRP she)) (VP (VBZ fails) (S (VP (TO to) (VP (VB provoke) (NP (PRP them)))))) (. .)))
(ROOT (S (NP (PRP )) (VP (VBZ ) (S (VP (TO ) (VP (VB ) (NP (PRP )))))) (. )))