"a" is not an "article type adjective" it is an indefinite article.
The difference is because of the verb "to be".
Compare, "I am a furry" with "I killed a furry". The first only mentions one object, me and says that I am located in the class of furries. The second mentions two items, me, and the furry I killed.
The difference is because of the verb "to be".
Compare, "I am a furry" with "I killed a furry". The first only mentions one object, me and says that I am located in the class of furries. The second mentions two items, me, and the furry I killed.
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