Ostaa

Ostaa is a Finnish verb meaning to buy or to purchase. It is used transitively to indicate acquiring goods or services and typically requires a direct object referring to what is bought. The action is commonly associated with commerce, stores, and exchanges, but it can describe obtaining anything for oneself or another.

Conjugation: Ostaa is a regular verb of the first conjugation. Present indicative forms are: minä ostan, sinä ostat, hän ostaa, me ostamme, te ostatte, he ostavat. Imperfect (past) forms are: ostin, ostit, osti, ostimme, ostitte, ostivat. Perfect forms with olla are: olen ostanut, olet ostanut, hän on ostanut, olemme ostaneet, olette ostaneet, he ovat ostaneet.

Object use and syntax: The direct object is typically in the partitive case in ordinary, non‑definite purchases (for example, Ostan kahvia). For a definite, completed purchase of a specific item, the object may appear in a genitive or a definite form (for example, Ostin kirjan). Expressions of source or location often use from/from where with words like kaupasta (from the store) or verkkokaupasta (from online store).

Etymology and status: Ostaa is a native Finnish verb and part of the core vocabulary. Its basic meaning is stable across dialects, and it appears in a wide range of compounds and idioms related to buying, selling, and shopping.