 She's paying him for the apartment.
( She ( ( 's ( ( paying him ) ( for ( the apartment ) ) ) ) . ) )
(ROOT (S (NP (PRP She)) (VP (VBZ 's) (VP (VBG paying) (NP (PRP him)) (PP (IN for) (NP (DT the) (NN apartment))))) (. .)))
She pays him $500 for the apartment.
( She ( ( ( pays him ) ( ( $ 500 ) ( for ( the apartment ) ) ) ) . ) )
(ROOT (S (NP (PRP She)) (VP (VBZ pays) (NP (PRP him)) (NP (NP ($ $) (CD 500)) (PP (IN for) (NP (DT the) (NN apartment))))) (. .)))