ca n't generate enough heat in this cold vacuum of a comedy to start a reaction . 
(ROOT (S (VP (MD ca) (RB n't) (VP (VB generate) (NP (NP (JJ enough) (NN heat))) (PP (IN in) (NP (NP (DT this) (JJ cold) (NN vacuum)) (PP (IN of) (NP (DT a) (NN comedy))))) (S (VP (TO to) (VP (VB start) (NP (DT a) (NN reaction))))))) (. .)))
(ROOT (S (VP (MD ) (RB ) (VP (VB ) (NP (NP (JJ ) (NN ))) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (NN ))))) (S (VP (TO ) (VP (VB ) (NP (DT ) (NN ))))))) (. )))