We have a thread on Greek Colloquies here on Textkit. Check it out. Some may frown at the works from Renaissance scholars: your mileage may vary. Hermeneumata Pseudodositheana is from the Roman Imperial era. Arguably the best is Sprechen Sie Attisch?, which used material mostly from Plato and Aristophanes. As a shameful plug to my YouTube channel, I read my Ørbergized version here:
ἆρα Ἀττικιστὶ λέγεις;
2 Likes