( Snakes ( ( ( do n't ) ( ( ( ( sting or ) use ) ( their ( forked tongues ) ) ) ( as weapons ) ) ) . ) )
(ROOT (S (NP (NNS Snakes)) (VP (VBP do) (RB n't) (VP (VB sting) (CC or) (VB use) (NP (PRP$ their) (JJ forked) (NNS tongues)) (PP (IN as) (NP (NNS weapons))))) (. .)))
Snakes don't sting or use their forked tongues as weapons.
(ROOT (S (NP (NNS Snakes)) (VP (VBP use) (NP (PRP$ their) (NN tongue)) (PP (TO to) (NP (NN smell) (NNS things)))) (. .)))
Snakes use their tongue to smell things.