the acting is just fine , but 
(ROOT (S (NP (DT the) (NN acting)) (VP (VP (VBZ is) (ADJP (RB just) (JJ fine))) (, ,) (CC but))))
(ROOT (S (NP (DT ) (NN )) (VP (VP (VBZ ) (ADJP (RB ) (JJ ))) (, ) (CC ))))