Translation:His wife is coming home tomorrow morning.
I have heard Swedes use i morgon bitti to mean "first thing in the morning" or "very early".
It's never used on its own. It's a contraction of an old word bittida which meant 'early'. That word is very rarely used today, mostly in the set expression bittida och sent 'late and early' i.e. at all times of day.
Is it appropriate to write "i morgon" as one word, as one would with "idag"?
Both those can be written both apart and together. The language council recommends writing them apart, so we do that everywhere in our course, but the other version is also accepted everywhere.
I had written them together for a bunch of questions while strengthening Future Verbs, but it was marked wrong every time, which is why I was asking :)
'Marked wrong' as in it tells you 'another correct answer', yes, that is because we can't add both as 'best' because then they'd both pop up in all multiple choice questions everywhere and that would be very boring.
'Marked wrong' as in 'lose a heart', that should never happen, and if it does, you should definitely send a report via the Report a problem button.
'Marked Wrong' as in called a typo and added a space between(the space was underlined).
It's an old word or a short form of the old word bittida meaning 'early' but it's only ever used in this context today.
'i morgon bitti' is, 'in the morning' (no early)? How would one say, 'early in the morning'?
It only means 'tomorrow morning' nowadays. 'early in the morning' is tidigt på morgonen. And 'early tomorrow morning' can be e.g. tidigt i morgon bitti.
In the previous sentence kommer was used as going, in this sentence it is coming....how do we know which is being used
I can't see what the previous sentence was for you, it's random. As a general answer though, it depends on the meaning. If the sentence is about whether someone will come to a place, use kommer. If it's about whether they will go there, use går.
Maybe Guntan's sentence was "something is GOING to happen" / någonting KOMMER att ske. Be going to/ kommer att, futurum