( Volume ( ( is ( ( the space ) ( occupied ( by ( the matter ) ) ) ) ) . ) )
(ROOT (S (NP (NN Volume)) (VP (VBZ is) (NP (NP (DT the) (NN space)) (ADJP (VBN occupied) (PP (IN by) (NP (DT the) (NN matter)))))) (. .)))
Volume is the space occupied by the matter.
(ROOT (S (NP (NN Volume)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space)))))) (SBAR (IN that) (S (NP (NP (DT a) (NN substance)) (CC or) (NP (DT an) (NN object))) (VP (VBZ occupies))))) (. .)))