Questions & Answers about On mówi o rodzinie.
The basic dictionary form is rodzina (nominative case: a family / the family).
In the sentence On mówi o rodzinie, rodzinie is not the subject; it follows the preposition o.
- The preposition o (in the sense of about) requires the locative case.
- The locative singular of rodzina is rodzinie (ending -ie).
So rodzina → rodzinie simply shows the grammatical role: about (the) family.
Rodzinie is in the locative case (przypadek miejscownik).
The locative:
- Almost always appears after certain prepositions, such as o, w, na, po, przy (in some of their meanings).
- Often answers questions like o kim? o czym? (about whom? about what?) or w kim? w czym? (in whom? in what?).
Examples:
- Myślę o rodzinie. – I’m thinking about (the) family.
- Mieszkam w Warszawie. – I live in Warsaw.
- Na uniwersytecie – at the university.
So in On mówi o rodzinie, the locative marks the topic of speaking.