Questions & Answers about Jeg tæller bøgerne på hylden.
Because bøgerne is the definite plural form: the books.
- en bog = a book
- bøger = books
- bøgerne = the books
Danish often puts the definite ending directly on the noun instead of using a separate word like the in English.
Also, this noun changes vowel in the plural:
- bog → bøger
So bøgerne is not just bog + erne in a simple mechanical way you can always guess; it is a real plural form you need to learn.
Because hylden is the definite singular form of en hylde.
- en hylde = a shelf
- hylden = the shelf
So på hylden means on the shelf.
Just like with bøgerne, Danish usually marks definiteness by adding an ending to the noun.