is nevertheless efficiently amusing for a good while . 
(ROOT (S (VP (VBZ is) (ADVP (RB nevertheless)) (ADJP (RB efficiently) (JJ amusing)) (PP (IN for) (NP (DT a) (JJ good) (NN while)))) (. .)))
(ROOT (S (VP (VBZ ) (ADVP (RB )) (ADJP (RB ) (JJ )) (PP (IN ) (NP (DT ) (JJ ) (NN )))) (. )))