The future perfect active is usually formed periphrastically (unlike the m/p), but is there a future perfect active optative? To form it, you would need to add the perfect participle to the future optative of "to be." Mastronarde says on p. 320, "The future perfect active indicative (or opt.) is normally formed periphrastically, from perfect active participle plus future indicative (or opt.) of eimi."
Is this right?? Is this possible?? Can somebody point me to this future optative form of eimi??
pster wrote:But why would it use secondary endings?
Again from Smyth (805), "Many verbs have no active future, but use instead the future middle in an active sense."
I don't pretend to know why with any certainty but I would think that it has to do with the fact that the subject is participating in the action of the verb. In Modern Greek, the verb "to be" has secondary endings in all tenses. Instead of εἰμί, it is είμαι.