Words have genders, similar to der, die, das in German (since you are already at level 10 in German).
- Masculine/Feminine - de (der and die in German)
- Neuter - het (das in German).
There doesn't seem to be a logic, i am also struggling with this because its a matter of remembering individual words and their assigned genders. Other languages have the same problem. However i dont understat why Vrouw is assigned woth De