this story of unrequited love does n't sustain interest beyond the first half-hour . 
(ROOT (S (NP (NP (DT this) (NN story)) (PP (IN of) (NP (JJ unrequited) (NN love)))) (VP (VBZ does) (RB n't) (VP (VB sustain) (NP (NN interest)) (PP (IN beyond) (NP (DT the) (JJ first) (NN half) (HYPH -) (NN hour))))) (. .)))
(ROOT (S (NP (NP (DT ) (NN )) (PP (IN ) (NP (JJ ) (NN )))) (VP (VBZ ) (RB ) (VP (VB ) (NP (NN )) (PP (IN ) (NP (DT ) (JJ ) (NN ) (HYPH ) (NN ))))) (. )))