( ( ( One gram ) ( of protein ) ) ( ( converts ( into ( four calories ) ) ) . ) )
(ROOT (S (NP (NP (CD One) (NN gram)) (PP (IN of) (NP (NN protein)))) (VP (VBZ converts) (PP (IN into) (NP (CD four) (NNS calories)))) (. .)))
One gram of protein converts into four calories.
(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))))) (. .)))