Being interested (kiinnostunut + -sta)

Interested OUT OF Something

English is interested in; Finnish is interested out of. Kiinnostunut — the participle of kiinnostua — always takes the elative -sta/-stä:

Olen kiinnostunut musiikista.I am interested in music.
Oletko kiinnostunut historiasta?Are you interested in history?
En ole kiinnostunut urheilusta.I am not interested in sports.

You have been drilling the expression since it was carded in this lesson — this is the rule behind those drills. The same elative pattern returns with a whole family of feeling-words later (B1), so learn the shape here: feeling + -sta = feeling ABOUT.

Are you interested in history?
Oletko kiinnostunut historiasta?

Kiinnostunut agrees

Like any adjective-shaped word, it agrees in number: me olemme kiinnostuneita (partitive plural — you know it from the partitive-plural lesson).

The child is interested in everything.
Lapsi on kiinnostunut kaikesta.

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