at times , it actually hurts to watch . 
(ROOT (S (PP (IN at) (NP (NNS times))) (, ,) (NP (PRP it)) (ADVP (RB actually)) (VP (VBZ hurts) (S (VP (TO to) (VP (VB watch))))) (. .)))
(ROOT (S (PP (IN ) (NP (NNS ))) (, ) (NP (PRP )) (ADVP (RB )) (VP (VBZ ) (S (VP (TO ) (VP (VB ))))) (. )))