, it is clearly a good thing . 
(ROOT (S (, ,) (NP (PRP it)) (VP (VBZ is) (ADVP (RB clearly)) (NP (DT a) (JJ good) (NN thing))) (. .)))
(ROOT (S (, ) (NP (PRP )) (VP (VBZ ) (ADVP (RB )) (NP (DT ) (JJ ) (NN ))) (. )))