of ` should have been a sketch on saturday night live 
(ROOT (S (PP (IN of) (`` `)) (VP (MD should) (VP (VB have) (VP (VBN been) (NP (DT a) (NN sketch)) (PP (IN on) (NP (NP (NNP saturday) (NN night)) (ADVP (JJ live)))))))))
(ROOT (S (PP (IN ) (`` )) (VP (MD ) (VP (VB ) (VP (VBN ) (NP (DT ) (NN )) (PP (IN ) (NP (NP (NNP ) (NN )) (ADVP (JJ )))))))))