This is not newsletter.
( This ( ( ( is not ) newsletter ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (RB not) (NP (NN newsletter))) (. .)))
This is a newsletter.
( This ( ( is ( a newsletter ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (DT a) (NN newsletter))) (. .)))