Hun vs Henne
Why do you say "Hun heter Astrid" and not "Henne heter Astrid"? I thought "hun" was "she" and "henne" was "her"? Is henne only used as the object of a sentence? If I wanted to say "her scarf is blue" would I use hun or henne?
There is an explanation from Deliciae in the sentence discussion:
You've probably already worked it out. Basically, you're right.
-- "Hun" = "she" (subject)
-- "Henne" = "her" (when she is the object)
-- Possessive, "her scarf is blue", you would use "hennes". In other sentences, you would use "sin/si/sitt" if she is the subject of the sentence, like "She drove her car."
One more weird thing worth mentioning... What about copulas? What about a sentence like, "It is I/me" or "The doctor is I/me", or "Who is Gertrude? I am she/her." Do you use object case or subject case here (in English or in Norsk)?
Well, in Norsk, Duolingo exercises seem to suggest object case is preferred. I don't know if subject case is possible.
In English, I think subject case is perceived as more formal/"proper". But object case is probably more common...