have been a sketch on saturday night live 
(ROOT (VP (VBP have) (VP (VBN been) (NP (DT a) (NN sketch)) (PP (IN on) (NP (NP (NNP saturday) (NN night)) (JJ live))))))
(ROOT (VP (VBP ) (VP (VBN ) (NP (DT ) (NN )) (PP (IN ) (NP (NP (NNP ) (NN )) (JJ ))))))