Questions & Answers about Boken tilhører henne, ikke meg.
Because henne is the object form of hun (she). The verb tilhøre (to belong to) takes the possessor as an object: the book belongs to her → boken tilhører henne. Using the subject form (hun) here would be ungrammatical.
- Subject: hun
- Object: henne
In the contrastive tail ikke meg the pronoun stands for the object of the verb (understood as “…does not belong to me”), so you need the object form meg, not the subject form jeg. Compare:
- Correct here: Boken tilhører henne, ikke meg.
- Different construction: Det er ikke jeg. (after the verb er, prescriptive standard prefers the subject form; in everyday speech you’ll also hear meg)
Yes. Boken er hennes is very common and a bit more neutral/colloquial. Boken tilhører henne sounds a touch more formal/literary or legalistic. Both mean the same in everyday contexts.
- Parallel contrast: Boken er hennes, ikke min.