why is it "viktige" not "viktig" is it because it is a definite-bestemt ?
Yes, that's it. :)
Tack for hjelpen Linn
How would you say "the important test is in the morning?"
Den viktige prøven er i morgen tidlig
Why is it "den viktige prøven" and not just "viktigen prøven"?
Because of the adjective (scroll down to 'adjectives in the definite form'): https://www.duolingo.com/skill/nb/Adjectives/tips-and-notes