The Subjunctive Mood
Denotes that which is objectively possible, contingent upon certain existing and known facts.
The Hortatory Subjunctive
The speaker or writer uses the first person plural to exhort others to join with him in an action. It is translated “let us.” Here the subjunctive may be used in a main clause to express exhortation, request, or proposal, thus supplying the lack of the first person in the imperative mood.
The Subjunctive of Prohibition
This use nearly always employs the second person aorist subjunctive to express a negative entreaty or command. It forbids the beginning of an act and may be translated “don’t even start…”. The third person may be used with dependent clauses of fear or warning in addition to prohibition.