( ( Waterfall ( , Waterfall ) ) ( ( ( fall on ) forever ) . ) )
(ROOT (S (NP (NNP Waterfall) (, ,) (NNP Waterfall)) (VP (VBP fall) (PRT (RP on)) (ADVP (RB forever))) (. .)))
Waterfall, Waterfall fall on forever.
(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))))) (. .)))