The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
162. The Tenses of the Subjunctive are chiefly used
in dependent clauses, following the rule for the Sequence of Tenses; but
have also special idiomatic uses (see Syntax).
For the use of Tenses in the Imperative, see §§ 448, 449.