is a crime that should be punishable by chainsaw 
(ROOT (VP (VBZ is) (NP (NP (DT a) (NN crime)) (SBAR (WHNP (WDT that)) (S (VP (MD should) (VP (VB be) (VP (VBN punishable) (PP (IN by) (NP (NN chainsaw)))))))))))
(ROOT (VP (VBZ ) (NP (NP (DT ) (NN )) (SBAR (WHNP (WDT )) (S (VP (MD ) (VP (VB ) (VP (VBN ) (PP (IN ) (NP (NN )))))))))))