( ( A calorie ) ( ( is ( ( a unit ) ( used ( to ( measure energy ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN calorie)) (VP (VBZ is) (NP (NP (DT a) (NN unit)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN energy)))))))) (. .)))
A calorie is a unit used to measure energy.
(ROOT (S (NP (NP (DT Another) (NN unit)) (PP (IN of) (NP (NN energy))) (, ,) (VP (VBN used) (ADVP (RB widely)) (PP (IN in) (NP (NP (DT the) (NN health) (NNS professions)) (CC and) (NP (JJ everyday) (NN life))))) (, ,)) (VP (VBZ is) (ADJP (JJ calorie)) (PRN (-LRB- -LRB-) (NP (NN cal)) (-RRB- -RRB-))) (. ?)))