just is n't a very involving one 
(ROOT (S (ADVP (RB just)) (VP (VBZ is) (RB n't) (NP (DT a) (ADJP (RB very) (VBG involving)) (NN one)))))
(ROOT (S (ADVP (RB )) (VP (VBZ ) (RB ) (NP (DT ) (ADJP (RB ) (VBG )) (NN )))))