Questions & Answers about Äiti on huolissaan pojasta.
Finnish doesn’t use articles like “the” or “a/an” at all.
- Äiti can mean “a mother” or “the mother” depending on context.
- pojasta can mean “about a boy” or “about the boy”.
The definiteness or indefiniteness is understood from the situation or from earlier context, not from a separate word.
huolissaan is an idiomatic form that functions like an adjective meaning “worried”.
Literally, it comes from the noun huoli (worry, concern) plus:
- -ssa: an inessive ending (“in”), and
- -an: a 3rd-person possessive suffix (“his/her/their”).
Historically, it’s something like “in his/her worries”, but in modern Finnish you just learn olla huolissaan as a fixed expression meaning “to be worried”.
In a sentence like Äiti on huolissaan, huolissaan is a predicative (like an adjective used with olla “to be”), similar to “The mother is worried.”