( ( One example ) ( ( is ( ( the use ) ( of ( water changes ) ) ) ) . ) )
(ROOT (S (NP (CD One) (NN example)) (VP (VBZ is) (NP (NP (DT the) (NN use)) (PP (IN of) (NP (NN water) (NNS changes))))) (. .)))
One example is the use of water changes.
(ROOT (S (NP (NP (CD One) (NN example)) (PP (IN of) (NP (NN matter)))) (VP (VBZ is) (NP (NN water))) (. .)))
One example of matter is water.