 It can't hurt you.
( It ( ( ( ca n't ) ( hurt you ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD ca) (RB n't) (VP (VB hurt) (NP (PRP you)))) (. .)))
It can hurts others, but not you.
( It ( ( can ( ( ( ( hurts others ) , ) but ) ( not you ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD can) (VP (VP (VB hurts) (NP (NNS others))) (, ,) (CC but) (VP (RB not) (NP (PRP you))))) (. .)))