In what contexts do Greeks use the ancient Greek adverb εὖ? I noticed it on a website entitled Ευ Ποδηλατείν/Good Cycling. Is it used in speech? If so, could I see some examples of its usage?
Το ευ ζην το είχαμε, αλλά με δανεικά και άλλα ευτράπελα. Τώρα μας έμεινε τοουκ εν τω πολλώ το ευ.
Right now I can't think of an example in common speech, Theseus, except in compounds, of which there are lots of everyday words e.g. ευχαριστώ, εύκολο, ευτυχώς and many more. You can see for yourself if you search for ευ%here.
I'd like to add that it's also used sarcastically on some occasions. This use is almost always obvious, where in most cases "ευ" is followed by an ancient-like infinitive (usually fake, based on modern verbs).