it gets it
( it ( gets it ) )
(ROOT (S (NP (PRP it)) (VP (VBZ gets) (NP (PRP it)))))
It doesn't get it.
( It ( ( ( does n't ) ( get it ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ does) (RB n't) (VP (VB get) (NP (PRP it)))) (. .)))