( ( ( ( ( ( All snakes ) ( are carnivorous ) ) , ) but ) ( they ( ( do not ) chew ) ) ) . )
(ROOT (S (S (NP (DT All) (NNS snakes)) (VP (VBP are) (ADJP (JJ carnivorous)))) (, ,) (CC but) (S (NP (PRP they)) (VP (VBP do) (RB not) (VP (VB chew)))) (. .)))
All snakes are carnivorous, but they do not chew.
(ROOT (S (NP (NNS Snakes)) (VP (VBP are) (NP (JJ carnivorous) (NNS animals))) (. .)))