a movie that keeps throwing fastballs 
(ROOT (NP (NP (DT a) (NN movie)) (SBAR (WHNP (WDT that)) (S (VP (VBZ keeps) (S (VP (VBG throwing) (NP (NNS fastballs)))))))))
(ROOT (NP (NP (DT ) (NN )) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (S (VP (VBG ) (NP (NNS )))))))))