Learn Danish: Har forfatteren fundet artiklen? - Has the author found the article?

The infinitive is at finde (to find). It is a strong (irregular) verb, meaning it changes its inner vowel rather than taking a standard ending. When paired with har to form the present perfect tense (has found), it takes its past participle form, which is fundet.

Does the ending of fundet change based on the nouns in the sentence?

No. When you use the helper verb har to make the present perfect tense, the main verb is locked into this specific past participle form. It will always end in -t (like fundet), regardless of whether the subject or object is an en word or an et word.

Why is it spelled artiklen instead of artikelen?

The base noun is en artikel (an article). When adding the definite ending -en to mean "the article", Danish drops the final e of the base word. This is a common spelling rule to make pronunciation smoother for nouns that end in -el, -en, or -er.

Why aren't there any separate words for "the" in this question?

Unless there is an adjective describing the noun, Danish attaches "the" to the end of the noun as a suffix. The -en at the end of both forfatteren (the author) and artiklen (the article) is what translates to "the".