( ( In humans ) ( , ( digestion ( ( begins ( in ( ( ( the mouth ) , ) ( where ( food ( is ( ( chewed and ) ( salivary ( amylase ( begins ( to ( digest carbohydrates ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NNS humans))) (, ,) (NP (NN digestion)) (VP (VBZ begins) (PP (IN in) (NP (NP (DT the) (NN mouth)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NN food)) (VP (VBZ is) (ADJP (ADJP (JJ chewed)) (CC and) (ADJP (RB salivary) (JJ amylase) (SBAR (S (VP (VBZ begins) (S (VP (TO to) (VP (VB digest) (NP (NNS carbohydrates)))))))))))))))) (. .)))
In humans, digestion begins in the mouth, where food is chewed and salivary amylase begins to digest carbohydrates.
(ROOT (S (NP (JJ Carbohydrate) (NN digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))