( ( ( ( All ( the ( different forms ) ) ) ( of energy ) ) ( -LRB- ( ( ( heat , ) ( electrical ( , ( nuclear ( , ( sound etc. ) ) ) ) ) ) -RRB- ) ) ) ( ( can ( be ( ( broken down ) ( into ( ( ( ( ( two categories ) , ) potential ) and ) ( kinetic energy ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (PDT All) (DT the) (JJ different) (NNS forms)) (PP (IN of) (NP (NN energy)))) (PRN (-LRB- -LRB-) (NP (NP (NN heat)) (, ,) (NP (JJ electrical) (, ,) (JJ nuclear) (, ,) (JJ sound) (NN etc.))) (-RRB- -RRB-))) (VP (MD can) (VP (VB be) (VP (VBN broken) (PRT (RP down)) (PP (IN into) (NP (NP (CD two) (NNS categories)) (, ,) (NP (NN potential)) (CC and) (NP (JJ kinetic) (NN energy))))))) (. .)))
All the different forms of energy (heat, electrical, nuclear, sound etc.) can be broken down into two categories, potential and kinetic energy.
(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))))) (. .)))