The word "not" is an adverb. I am trying to clarify what it modifies.
1: Consider the sentence: "The person is not smart".
Is "not" modifying "is" or "smart"? How can I tell?
According to the Stanford Parser, the parse tree is:
(ROOT (S (NP (DT That) (NN person)) (VP (VBZ is) (RB not) (ADJP (JJ smart))) (. .)))
2: Consider a second sentence: "That figure is not a person".
Is "not" modifying "a person"? If so, then "not" would be an adjective, yes?
(ROOT (S (NP (DT That) (NN figure)) (VP (VBZ is) (RB not) (NP (DT a) (NN person))) (. .)))
In both cases, it looks like "not" is only modifying the verb.