Interesting - "do you know where is the subway?" gets accepted, but it shouldn't: http://www.perfect-english-grammar.com/indirect-questions.html
You mean, specifically, that "You know where the subway is?" is not accepted? While that form is not actually wrong, its use would be unusual, unless you wanted to express surprise that somebody might know that piece of information. In the context that you walk up to somebody on the street to learn where the subway is, I'd recommend the "do" form...
Well, technically any Polish question can be interpreted as such if only it doesn't start with "czy".
Also I guess it works as a real question in more colloquial language, when you're talking to your friend.
We've been adding those everywhere, so added here as well.
It sounds about right to me; in my native pronunciation (London, England) I'd probably say "metroh" (last vowel to rhyme with "go"). Otherwise, the recording seems to be just a regular short "o" preceded by a rolled "r". Possibly there's just a hint of a terminal nasalisation.
Why can't I say subway without "the"? What if the speaker is asking about cities that have a subway?
You mean you wanted to say "Do you know where subway is?"? Not really English, I'm afraid; for New York, for example, it needs the "the" or you could say "Do you know where there is a subway station?".
In England, the entire question would be puzzling anyway, because a subway is either a sandwich shop or a pedestrian underground walkway. In London, most people would use the term "tube" with or without "station", even for the non-tube lines, but that's a whole other cano' worms.
if you say it without the "the" then people will probably think you're asking about the restaurant lol
That's how English works. If you ask a question on it's own, it's "Where is the metro", but if you embed it in a sentence, it doesn't use this reverse word order, it ends up as "Do you know where the metro is".
Strange...I said 'Do you know where is the metro?' ...because I say it fairly naturally. I did not know it was grammatically wrong even tho' it sounds a trifle stilted and archaic!