Questions & Answers about De pågrep ham i går.
In this sentence, it means they.
The capital D is there because De is the first word of the sentence. If the same word came later, it would normally be written de.
There is also an older, formal De meaning polite you, but that is uncommon in modern Norwegian. At the beginning of a sentence, De can therefore look ambiguous by itself, but if the meaning shown is They arrested him yesterday, then you should understand it as they.
Pågrep is the simple past (preterite).
The infinitive is å pågripe, meaning to arrest / to apprehend.
A useful set of forms is:
- å pågripe = to arrest
- pågriper = arrests / is arresting
- pågrep = arrested
- har pågrepet = has/have arrested
So De pågrep ham i går is simply They arrested him yesterday.