( Volume ( ( measures ( ( ( the amount ) ( of space ) ) ( ( an object ) ( takes up ) ) ) ) . ) )
(ROOT (S (NP (NN Volume)) (VP (VBZ measures) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space))) (SBAR (S (NP (DT an) (NN object)) (VP (VBZ takes) (PRT (RP up))))))) (. .)))
Volume measures the amount of space an object takes up.
(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))))) (. .)))