It is kind of astonishing how much the "ar" disappears when combined with "det"
I'm willing to bet quite a bit that the same thing happens all the time in your native language and you just don't notice it. :D It just takes lots and lots of practice.
So, when does it mean "evening" and when is it "night". Also, how can you know when it means which one?
Kind of hard to speak about it very definitely. But kväll commonly refers to the time from about six in the evening to some time between 21 and 01 depending on who you ask. So it overlaps both "evening" and "night" in English, since English will often use "night" way earlier than Swedish will use "natt".
How is kväll pronounced? I can't quite make it out. Sounds like kwell to me. Is it interchangeable as night/evening?
yes, and imorgon = tomorrow. I looked up your song.. it reminds me of that Iconapop hit