[quote=paul]The use of the Greek future indicative to say "I will go to Troy." means that my going is a certainty; not unlike "the sun will rise tomorrow".
In "Let us go to Troy", the Greek subjunctive expresses not only futurity and my interest (will) in such a trip, but also possible conditions on which the trip depends, namely that there are others involved who may not want to go to Troy. The literature would call this 'less immediate'.
In "May we go to Troy", the Greek optative expresses not only futurity and my interest (wish) in such a trip, but also the sense that there is a greater likelihood that we may not get to Troy - that some condition stands in the way. This is 'least immediate' or 'remote futurity'. [/quote]
Also, learn the different "schticks" of each mood - in Attic (I'm unfamiliar with Epic) there are only three uses of the optative and they're pretty easy to learn (Wish, Potential, and becuase a Subjuctive or Indicative in 2ndary sequence fell into it). Subjuctives have more variation, but aren't too hard.
Make sure you master the formulas for conditions, also. THat'll make life much easier.