optative contractions

Greek Learning Greek
1

I don’t really understand how the optative with iota-eta differs from the optative with just iota.

(Sorry about the moving target. I posted and then removed a long post. The pdf explains everything pretty well.)

2

Here is a pdf explaining things. Takes you back to Indo European! http://www.artsci.wustl.edu/~cwconrad/docs/AncientGreekVerb.pdf