Why is it not endeligt?
would also like to know this
Why is the subject after the verb in this sentence? Is it because the adverb?
YES. When the sentence starts with an adverb, there is inversion. So, instead of being Subject-Verb-Adverb; it becomes Adverb-Verb-Subject.
The inversion happens also in languages closely to Danish like German (which you study/studied) and Dutch