( ( SOUND ( ENERGY Sound ) ) ( ( is ( ( a form ) ( of ( energy ( produced ( by ( vibrating matter ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP SOUND) (NNP ENERGY) (NNP Sound)) (VP (VBZ is) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NP (NN energy)) (VP (VBN produced) (PP (IN by) (S (VP (VBG vibrating) (NP (NN matter)))))))))) (. .)))
SOUND ENERGY Sound is a form of energy produced by vibrating matter.
(ROOT (S (NP (NP (DT The) (NN sound)) (PP (IN in) (NP (DT a) (JJ loud) (NN classroom)))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NN energy))))))) (. .)))