Questions & Answers about Oslo er størst.
Norwegian normally does not use a separate word for “the” when a superlative adjective stands alone after er (or other linking verbs).
- Oslo er størst.
= Oslo is (the) biggest.
The idea of “the” is simply understood from the context. You only add a definite form when the superlative comes with a noun:
- Oslo er den største byen i Norge.
Oslo is the biggest city in Norway.
So:
- Oslo er størst. – No noun, no separate “the”.
- den største byen – With a noun, you show definiteness using den … -ste (the biggest city).