I have only a tiny smattering of Classical Greek so I need someone to check accuracy for me. Also, I don't know where to find Greek characters so I'm doing this in the Roman alphabet. Apologies for that.
I need to know if the following phrases work.
peri tinos dialegetai? - what is he talking about?
ouk epistamai - I don't know.
ara dunasai romaizein? - can you speak Latin?
ti? - what?