Nouns: Accusative Case — Finnish Grammar

Finnish makes a distinction English leaves to context: whether the action got through its object or not. "I ate the apple" and "I was eating an apple" differ in Finnish by one letter on the noun, and choosing the wrong one changes what you said rather than merely how you said it.

The ending for a finished, wholly affected object is -n in the singular and -t in the plural. Neither is new — -n is the ending an owner takes, -t the ending a plural subject takes. Nothing about the shape of the word marks it as an object; its job in the sentence does that, and the contrast below is what carries the meaning.

The Whole, Completed Object

The object is fully affected and the action reaches its end.

Ostin auton.
I bought a/the car. (the whole car, transaction complete)
Luin kirjan.
I read the (whole) book.
Hän joi maidon.
He/she drank the (whole) glass of milk.
Söimme koko kakun.
We ate the whole cake.

Finished Against Unfinished

The alternative ending, -a or -ä, presents the object as an open amount: partly affected, or the action still under way. The same verb takes either.

Söin omenan.
I ate the (whole) apple. (completed)
Söin omenaa.
I was eating (some of) an apple. (in progress)

omena-n against omena-a — one letter, and it decides whether the apple is gone
nothing else in either sentence changes; the ending carries the entire difference

Join kahvin. vs. Join kahvia.
I drank the (cup of) coffee. vs. I drank (some) coffee.

Why a Negative Sentence Cannot Use It

An action that did not happen cannot have finished, so a negated object always takes the open-amount ending instead.

Ostin auton. → En ostanut autoa.
I bought the car → I didn't buy a car.

auto-n becomes auto-a the moment the verb is negated

Pronouns Have a Distinct Form

Pronouns are the exception: as a whole object they take their own ending -t, which keeps them apart from the -n that marks a possessor.

Näin hänet.
I saw him/her.
Hän tunsi minut.
He/she recognised me.
Tapasin sinut eilen.
I met you yesterday.

In the course

Sentences from Lingora’s Finnish course

65 of the course's 500 sentences use this, the first in lesson 5. A few of them, with the words “Nouns: Accusative Case” is about in bold:

Isäni osti lahjan äidilleni.
My father bought a present for my mother.
Lesson 225
Minun täytyy ajaa pyörälläni, kunnes saan uuden auton.
I have to ride my bike until I get a new car.
Lesson 301
Haluan ostaa tämän kasvin. Se tulee näyttämään upealta huoneessani.
I want to buy this plant. It will look great in my room.
Lesson 384

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