All 15 Finnish cases, ranked by real use

Finnish has 15 cases in the same way a kitchen has 15 tools: technically true, but the chef is not reaching for the melon baller every thirty seconds.

We counted every morphological tag containing one of the conventional case labels in Arkisyn, the Language Bank of Finland’s morphosyntactically coded corpus of everyday conversation.¹ Its live Korp index reports 326,946 tokens and 50,150 sentence units. Our query returned 116,569 case-tagged token occurrences.

The ranking

Three cases take 78.14% of the tagged forms and the remaining twelve divide 21.86% between them. The drop is not gradual either: rank 1 is nearly four times rank 2, rank 2 is more than twice rank 4, and by rank 12 the counts are in the hundreds against tens of thousands at the top. A frequency list slopes. This falls off a shelf.

That shape is what a syllabus flattens when it presents the cases as fifteen equal boxes. Ranks 7 to 15 are nine of the fifteen. More than half the paradigm accounts for 8,326 forms, 7.14% of everything tagged.

The shares total 100% apart from rounding. We ran Korp’s count command over all Arkisyn tokens, grouped by the mrp attribute, matched each case label as a complete space-delimited tag and summed it. Searching the letters ine without tag boundaries, for example, would catch unrelated strings. Korp documents both grouped counts and corpus attributes.²

1-3: nearly four out of every five tagged forms

Nominative wins partly because it is the unmarked, dictionary-looking form. Subjects, predicate nouns and many plural objects land here.

• Bussi tulee.
  The bus is coming.
• Nää on mun avaimet.
  These are my keys.

Then comes the partitive. It marks, among other things, an unbounded quantity, an ongoing event’s object and the object of a negative clause. Finnish grammar does not reduce it to one English preposition because the choice is bound up with quantity, aspect and negation.³

• Juon kahvia.
  I'm drinking coffee.
• En juo kahvia.
  I don't drink coffee.

The genitive’s -n does more than possession. It also supplies the form used for many total singular objects. Finnish object marking alternates between nominative-like, genitive-like and partitive forms; the authoritative grammar treats that alternation separately from the tiny set with a distinctive accusative ending.⁴

4-8 and 10: the location machine

The six productive local cases form two three-step journeys.

In much southern colloquial Finnish, a final vowel may disappear: Mä oon kaupas, Mä tuun kaupast. These are widespread listening forms, not a rule for every dialect. The remaining -s versus -st still tells you location versus origin.

Adessive performs another ordinary trick:

• Onks sulla aikaa?
  Do you have time?

The Finnish possession pattern is built with the adessive: Onks sulla aikaa? literally places time “at you”. That extra job helps explain why adessive outranks two members of its own location family.

9 and 11: being something, becoming something

Essive makes a role or state; translative marks a change or destination state. They sit next to each other in the ranking because they answer the same question a beat apart: essive is what something is while you are looking at it, translative is what it turned into.

English does the same work with prepositions, and often with nothing at all. That is why the pair is easy to hear and hard to produce. “I work as a teacher” and “I qualified as a teacher” use one English word for two different relationships. Finnish uses two endings.

The translative also hides in a common deadline: Tuuks sä viideksi? asks “Will you come by five?” That one -ksi form turns up whenever somebody asks you to arrive by a particular time.

12-15: the restricted tail

Instructive occurs in expressions such as omin silmin, “with one’s own eyes”, and jalan, “on foot”. Abessive appears in rahatta, “without money”, but ordinary speech strongly favours ilman rahaa.

Comitative’s zero means the Arkisyn mrp values contained no com tag, not that the form is imaginary. Hän tuli lapsineen means “They came with their children.” Around a kitchen table, expect Se tuli lasten kaa. The descriptive grammar includes these restricted cases while showing why the borders of “the 15” are partly analytical.⁵

The accusative’s rank is the bigger optical illusion. Finnish has objects everywhere; only a narrow pronoun set displays an unmistakable accusative form:

The corpus guide warns that parsed and annotated searches can contain analysis errors.⁶ This table ranks tags in one Arkisyn version, not importance, difficulty or every conversation in Finland. The University of Turku describes its material as 29 hours across 26 texts; one conversation topic can move a low-frequency case noticeably.⁷

The useful order is not 1 through 15

When speech is moving too fast to parse every ending, group the cases by what you need to notice:

1. Hear now: nominative, partitive and genitive - including their object jobs.
2. Hear the route: inessive, elative, illative, adessive, ablative and allative.
3. Recognise on arrival: essive and translative, then the restricted tail.

Do not postpone object case until rank 13. The dedicated accusative tag is rare precisely because most objects have already been counted under nominative, genitive or partitive.