( ( ( ( ( The plural ) , ) falls ) , ) ( ( may ( apply ( ( ( to ( a ( single waterfall ) ) ) or ) ( to ( ( a series ) ( of waterfalls ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN plural)) (, ,) (VP (VBZ falls)) (, ,)) (VP (MD may) (VP (VB apply) (PP (PP (TO to) (NP (DT a) (JJ single) (NN waterfall))) (CC or) (PP (TO to) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (NNS waterfalls)))))))) (. .)))
The plural, falls, may apply to a single waterfall or to a series of waterfalls.
(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))))) (. .)))