( ( ( The ( snake 's ) ) tongue ) ( ( is harmless ) . ) )
(ROOT (S (NP (NP (DT The) (NN snake) (POS 's)) (NN tongue)) (VP (VBZ is) (ADJP (JJ harmless))) (. .)))
The snake's tongue is harmless.
(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.