Questions & Answers about Faðirinn kemur heim eftir vinnu.
Because -inn is the definite article attached to the noun.
- faðir = father / a father
- faðirinn = the father
Icelandic usually adds the definite article to the end of the noun instead of using a separate word like English the.
So in this sentence, faðirinn means the father.
It is in the nominative singular because it is the subject of the sentence — the person doing the action.
The verb is kemur = comes, and the one who comes is faðirinn, so nominative is used.
This noun is a little irregular:
- nominative singular: faðir
- accusative singular: föður
- dative singular: föður
- genitive singular: föður
With the definite article in the nominative singular, it becomes faðirinn.