Questions & Answers about Hun åbner sit vindue i stuen.
Danish has two types of “her/his/its” for third person singular:
- sin / sit / sine – reflexive possessive (refers back to the subject of the same clause)
- hans / hendes / dens / dets – non‑reflexive possessive (refers to someone/something else)
In Hun åbner sit vindue i stuen, the subject is Hun (she), and the window belongs to that same hun. So Danish uses the reflexive form:
- Hun åbner sit vindue… = She opens her own window.
If you said:
- Hun åbner hendes vindue i stuen, it normally means:
She opens *another woman’s window in the living room* (not her own).
So sit tells us the window belongs to hun herself.