( Volume ( ( is ( ( ( the amount ) ( of space ) ) ( ( an object ) occupies ) ) ) . ) )
(ROOT (S (NP (NN Volume)) (VP (VBZ is) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space))) (SBAR (S (NP (DT an) (NN object)) (VP (VBZ occupies)))))) (. .)))
Volume is the amount of space an object occupies.
(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))))) (. .)))