it is a whole lot of fun 
(ROOT (S (NP (PRP it)) (VP (VBZ is) (NP (NP (DT a) (JJ whole) (NN lot)) (PP (IN of) (NP (NN fun)))))))
(ROOT (S (NP (PRP )) (VP (VBZ ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN )))))))