The duolingo notes(pronouns objective) said den for en-words and det for ett-words as long as they're referring to a word in a separate sentence. But if it's in the current sentence (like he said, it's raining today) then it's det. Hope you could understand that. If not, try taking a look through the notes on the desktop version
What is the difference between "The Man's" and "The Men's" in Swedish? How would you say it or use it in a sentence?
- the man's = mannens
- the men's = männens
I actually made a recording of the difference a while ago, in another thread: https://forum.duolingo.com/comment/5796934/M%C3%A4nnen