( Snakes ( ( use ( ( ( ( ( their ( forked tongues ) ) ( to ( `` ( smell ( '' ( or ( `` taste ) ) ) ) ) ) ) , ) '' ) ( constantly ( flicking ( them ( to ( ( pick up ) ( any ( air-borne ( ( particles and ) odors ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Snakes)) (VP (VBP use) (NP (NP (PRP$ their) (JJ forked) (NNS tongues)) (PP (TO to) (NP (`` ``) (NN smell) ('' '') (CC or) (`` ``) (NN taste))) (, ,) ('' '') (VP (ADVP (RB constantly)) (VBG flicking) (S (NP (PRP them)) (VP (TO to) (VP (VB pick) (PRT (RP up)) (NP (DT any) (JJ air-borne) (NNS particles) (CC and) (NNS odors)))))))) (. .)))
Snakes use their forked tongues to &quot;smell&quot; or &quot;taste,&quot; constantly flicking them to pick up any air-borne particles and odors.
(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.