Norwegian personal pronouns are, as in English, declined in case with a subject form and a an object form.
Because of the gender system in nouns,Norwegian has two different pronouns for the English pronoun “it”. If you are talking about a thing that is feminine or masculine, you will have to use “den”. If you are referring to a neutral noun, the word “det” will be the correct one.
Han har en fin bil . Jeg liker den.
(He has a fine car. I like it.)
Hun har et hyggelig hus. Jeg liker det .
(She has a nice house. I like it.)