I didn't hit nothing.
( I ( ( ( did n't ) ( hit nothing ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD did) (RB n't) (VP (VB hit) (NP (NN nothing)))) (. .)))
I didn't hit anything while playing.
( I ( ( ( did n't ) ( ( hit anything ) ( while playing ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD did) (RB n't) (VP (VB hit) (NP (NN anything)) (PP (IN while) (NP (NN playing))))) (. .)))