Using a couple of basic methods borrowed from linguistics, I helped a friend whose just working through first year Greek understand how the verbal system works:
Binary Features (from Phonology)
Position Class Charts (from Generative Morphology)
So simple; so basic, but today I received an e-mail from him saying,
“[Y]ou’re a life saver, this stuff makes so much more sense now, THANKS!”
These are the days I’m glad I studied linguistics.