Words that are in the present tense are categorized as a Spanish subjunctive. Any word which is stated in the present is considered a Spanish subjunctive.

Yes, "you are hungry" is not in the subjunctive mood as it states a fact or condition that is real or true. Subjunctive mood is used to express a hypothetical or unreal situation.

Because it's in the subjunctive tense. The subjunctive does not change according to person (I, you, he, etc).

It is equivalent to the french subjunctive. You use it after ut and ne or to express an obligation

The subjunctive mood is for expressing wishes, suggestions, or desires, and is usually indicated by a verb such as wish or suggest, paired then with a subjunctive verb