( ( form ( of ( ( energy : ) ( Forms ( of energy ) ) ) ) ) ( ( include ( heat ( , ( light ( , ( electrical ( , ( mechanical ( , ( nuclear ( , ( ( sound and ) chemical ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN form)) (PP (IN of) (NP (NP (NN energy)) (: :) (NP (NP (NNP Forms)) (PP (IN of) (NP (NN energy))))))) (VP (VBP include) (NP (NN heat) (, ,) (NN light) (, ,) (JJ electrical) (, ,) (JJ mechanical) (, ,) (NN nuclear) (, ,) (NN sound) (CC and) (NN chemical))) (. .)))
form of energy  : Forms of energy include heat, light, electrical, mechanical, nuclear, sound and chemical.
(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))))) (. .)))