they are having so much fun 
(ROOT (S (NP (PRP they)) (VP (VBP are) (VP (VBG having) (NP (ADJP (RB so) (JJ much)) (NN fun))))))
(ROOT (S (NP (PRP )) (VP (VBP ) (VP (VBG ) (NP (ADJP (RB ) (JJ )) (NN ))))))