Questions & Answers about Ballongbuen står ved døren.
Because Norwegian very often makes compound nouns by writing them as a single word.
- ballong = balloon
- bue = arch / curve / bow
So:
- ballongbue = balloon arch
- ballongbuen = the balloon arch
Writing it as one word is the normal Norwegian pattern.
The ending -en is the definite article attached to the noun.
Compare:
- en ballongbue = a balloon arch
- ballongbuen = the balloon arch
In Norwegian, the definite article is often added to the end of the noun instead of being a separate word like English the.
For the same reason: døren is the definite form, meaning the door.
Compare:
- en dør = a door
- døren = the door
So the sentence refers to a specific door and a specific balloon arch.