( ( ( ( ( ( ( Proteins and ) ( carbohydrates each ) ) ( contribute ( ( four calories ) ( per gram ) ) ) ) , ) and ) ( fat ( ( contributes ( ( nine calories ) ( per gram ) ) ) ( to ( our ( energy needs ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NNPS Proteins)) (CC and) (NP (NP (NNS carbohydrates)) (NP (DT each)))) (VP (VBP contribute) (NP (NP (CD four) (NNS calories)) (PP (IN per) (NP (NN gram)))))) (, ,) (CC and) (S (NP (NN fat)) (VP (VBZ contributes) (NP (NP (CD nine) (NNS calories)) (PP (IN per) (NP (NN gram)))) (PP (TO to) (NP (PRP$ our) (NN energy) (NNS needs))))) (. .)))
Proteins and carbohydrates each contribute four calories per gram, and fat contributes nine calories per gram to our energy needs.
(ROOT (S (NP (NP (CD One) (NN gram)) (PP (IN of) (NP (NNS proteins)))) (VP (VBZ provides) (NP (NP (CD four) (NNS calories)) (PP (IN of) (NP (NN energy))))) (. .)))