by the time the surprise ending is revealed , interest can not be revived . 
(ROOT (S (PP (IN by) (NP (NP (DT the) (NN time)) (SBAR (S (NP (DT the) (NN surprise) (NN ending)) (VP (VBZ is) (VP (VBN revealed))))))) (, ,) (NP (NN interest)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN revived)))) (. .)))
(ROOT (S (PP (IN ) (NP (NP (DT ) (NN )) (SBAR (S (NP (DT ) (NN ) (NN )) (VP (VBZ ) (VP (VBN ))))))) (, ) (NP (NN )) (VP (MD ) (RB ) (VP (VB ) (VP (VBN )))) (. )))