( ( Waterfall ( The waterfall ) ) ( ( keeps ( falling down ) ) . ) )
(ROOT (S (NP (JJ Waterfall) (DT The) (NN waterfall)) (VP (VBZ keeps) (S (VP (VBG falling) (PRT (RP down))))) (. .)))
Waterfall The waterfall keeps falling down.
(ROOT (S (NP (NNP Iguassu) (NNP falls)) (VP (VBZ is) (NP (NP (DT the) (JJS largest) (NN waterfall)) (PP (IN on) (NP (DT the) (NN planet))))) (. .)))