Questions & Answers about Hun åpner munnen.
Because munnen is the definite singular form of munn.
- en munn = a mouth
- munnen = the mouth
In this sentence, Norwegian uses the definite form, so munnen means the mouth.
With body parts, Norwegian very often uses the definite noun instead of a possessive when it is obvious whose body part is meant.
So Norwegian prefers:
- Hun åpner munnen.
rather than:
- Hun åpner hennes munn.
This sounds more natural in Norwegian. English usually says her mouth, but Norwegian often just says the mouth in these situations.