( ( energy ( -LRB- ( ( heat ( , ( light ( , sound ) ) ) ) -RRB- ) ) ) ; )
(ROOT (NP (NP (NN energy)) (PRN (-LRB- -LRB-) (NP (NN heat) (, ,) (NN light) (, ,) (NN sound)) (-RRB- -RRB-)) (: ;)))
energy (heat, light, sound);
(ROOT (S (NP (NP (NNP Heat)) (, ,) (NP (NN light)) (, ,) (CC and) (NP (NN sound))) (VP (VBP are) (NP (NP (DT all) (JJ different) (NNS forms)) (PP (IN of) (NP (NN energy))))) (. .)))