Breakdown of Der Profi trainiert die Kinder im Park.
Questions & Answers about Der Profi trainiert die Kinder im Park.
Because Der Profi is the subject of the sentence.
- In German, the subject is in the nominative case.
- The masculine nominative singular article is der.
- Den is masculine accusative, which is used for direct objects, not subjects.
So we get:
- Nominative (subject): der Profi → Der Profi trainiert …
- Accusative (object): Ich sehe den Profi. (I see the professional.)
In your sentence, the professional is the one doing the action, so nominative: der, not den.