( We ( ( ( ( are ( good ( at ( distinguishing ( among ( cars ( , ( sneakers ( , ( and jewelry ) ) ) ) ) ) ) ) ) ) ( , ( ( for example ) , ) ) ) ( because ( ( our ancestors ) ( needed ( to ( be ( able ( to ( recognize ( ( ( ( ( ( carnivorous animals ) , ) ( poisonous snakes ) ) , ) and ) ( flavorful mushrooms ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP are) (ADJP (JJ good) (PP (IN at) (NP (NP (JJ distinguishing)) (PP (IN among) (NP (NNS cars) (, ,) (NNS sneakers) (, ,) (CC and) (NN jewelry)))))) (PRN (, ,) (PP (IN for) (NP (NN example))) (, ,)) (SBAR (IN because) (S (NP (PRP$ our) (NNS ancestors)) (VP (VBD needed) (S (VP (TO to) (VP (VB be) (ADJP (JJ able) (S (VP (TO to) (VP (VB recognize) (NP (NP (JJ carnivorous) (NNS animals)) (, ,) (NP (JJ poisonous) (NNS snakes)) (, ,) (CC and) (NP (JJ flavorful) (NNS mushrooms)))))))))))))) (. .)))
We are good at distinguishing among cars, sneakers, and jewelry, for example, because our ancestors needed to be able to recognize carnivorous animals, poisonous snakes, and flavorful mushrooms.
(ROOT (S (NP (NNS Snakes)) (VP (VBP are) (NP (JJ carnivorous) (NNS animals))) (. .)))