( ( ( One gram ) ( of carbohydrate ) ) ( ( provides ( four calories ) ) . ) )
(ROOT (S (NP (NP (CD One) (NN gram)) (PP (IN of) (NP (NN carbohydrate)))) (VP (VBZ provides) (NP (CD four) (NNS calories))) (. .)))
One gram of carbohydrate provides four calories.
(ROOT (S (NP (NP (CD One) (NN gram)) (PP (IN of) (NP (NNS carbohydrates)))) (VP (VBZ provides) (NP (NP (CD four) (NNS calories)) (PP (IN of) (NP (NN energy))))) (. .)))