It took me a moment to understand this phrase, because in English it would be written out as "If yes, when?" and personally I feel that comma makes a huge difference in understanding written English. Also, I put the Greek phrase into google translate and it came up with "if ever" which is a very common phrase in the region of America that I'm from.
Good point while it's not possible to add anything to this sentence... no, not even a comma we will have it in the New Tree.
As for Google or any other translation site, they are notorious for their errors in translating sentences. For individual words those given in these dictionaries are more reliable; including Google. here.
I get: αν >"if", ναι> "yes" πότε > "when". "If yes, when?" I assure you this is the correct translation.
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Your input is greatly appreciated and we look forward to more.
Well frankly it's hard enough to get used to this as it is, but the lack of any question intonation whatsoever in the computer-generated speech is not exactly helping. It sounds like a non-question, it looks like a non-question. And then there's the lack of comma on top of it. So some additional hints would be welcome there.
Wow Jaye! Thank you. Your attention to detail is impressive! And Dimitra - Thank YOU! I am something of a plodder. Only in retirement have I attempted to learn languages. Some might say "Soon enough!" "Soon enough!" Sooner or later - it's thanks to the internet, and Thank you Duolingo!
πότε is a question word, as in "When did you come in?"
όταν is a conjunction, as in "You closed the door when you came in." -- it connects two phrases together, as in "you closed the door" and "you came in". It can sometimes be replaced by the phrase "at the time that", as in "You closed the door at the time that you came in".
(But you can't say "At the time that you came in?" -- that shows that the "when" in "When did you come in?" is the question word.)
Funny that robert672165 just used what is a natural English expression "If so, ...". In English we don't say "If yes, ...", rather we say "If so, ...". The former sounds like a poor translation. I understand that this is not an English course, but I think that at least a correct translation should be used and marked as correct.