Chapter 661A School Grammar of Attic GreekDickinson CollegeChristopher Francese
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661 Direct questions, when made indirect, retain the original mode
and tense; but after historical tenses they may change an
indicative or subjunctive to the optative, like ὅτι clauses
(659 a).
Note especially that no indirect question has the subjunc-
tive unless the direct form has it (dubitative subjunctive, 471);
and that the optative is never required, even after a past
tense.