Translation:Surely the young men do not live in America?
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In the Tips, one of the examples with Num was given as a simple question, that the speaker still expected to be answered "no". So I put, "Do the young men live in America?!" I know Duo ignores punctuation, but still, shouldn't that be accepted?
Timor mortis conturbat me.
In my limited experience, we do not use in when the noun has a locative case, which means cities, small islands, and certain special places like home: domus in nominative, domum in accusative, and domi in locative.
America, being a continent—or at least an entire country—does not have a locative case, so we must use the preposition in.
There is nothing wrong with it grammatically. There exist, there don't exist; there are, there aren't; there sleeps, there do not sleep; there live, there do not live are all unexceptionable, but a bit ponderous. Nowadays the most common "there" construction is there is, there are. the same construction is often found with a following infinitive there seem to be several pages missing, there appears to be a hole in my bucket.
Otherwise, it is more usual to go with the simplest construction Surely young men don't live in America. Using there with other verbs marks you out as someone not familiar with modern usage in English. It is at best poetic, and and worst a bit archaic - although it can be used for dramatic effect: There goes my friend John, driving at a hundred and twenty again. We call him "Speedy!"
I typed 'Surely the young men don't live in the US' and it got marked as wrong. I've already reported this issue.