Learn Finnish: Hissi on välttämätön apuväline liikuntarajoitteiselle ihmiselle. - An elevator is a necessary aid for a mobility-impaired person.

In Finnish, the allative case is commonly used to express who benefits from, needs, or experiences something. While you could use a postposition phrase like liikuntarajoitteista ihmistä varten (intended for a mobility-impaired person), the allative ihmiselle is the most natural way to express that the elevator is a necessity directly to or for them.

How is the adjective välttämätön constructed?

It is built from the verb välttää (to avoid) combined with the negative suffix -mätön (without / un- -able). Literally, it means "unavoidable," but it is the standard Finnish word for "necessary," "essential," or "indispensable."

How do you break down the compound word liikuntarajoitteinen?

It combines liikunta (mobility / physical exercise) and rajoitteinen (restricted). The second part is formed from the noun rajoite (restriction / limitation) plus the common adjective-forming suffix -inen (having a...). Together, they describe someone who has a mobility restriction.

Why is apuväline written as one word instead of two?

Finnish heavily relies on compound nouns to express specific, unified concepts. Apu (help / aid) and väline (tool / instrument) combine into apuväline to mean a specific "assistive device" or "aid." Writing them separately would be grammatically incorrect because the first noun is acting as a permanent modifier to the second.