( Digestion ( actually ( ( ( ( begins ( in ( the mouth ) ) ) , ) ( as ( ( ( the enzymes ) ( in saliva ) ) ( begin ( to ( ( ( break down ) carbohydrate ) ( -LRB- ( starch -RRB- ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Digestion)) (ADVP (RB actually)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth))) (, ,) (SBAR (IN as) (S (NP (NP (DT the) (NNS enzymes)) (PP (IN in) (NP (NN saliva)))) (VP (VBP begin) (S (VP (TO to) (VP (VB break) (PRT (RP down)) (NP (NN carbohydrate)) (PRN (-LRB- -LRB-) (VB starch) (-RRB- -RRB-))))))))) (. .)))
Digestion actually begins in the mouth, as the enzymes in saliva begin to break down carbohydrate (starch).
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))