The genitive (genetiivi) is one of the most useful Finnish cases. Its ending is a single letter — -n — but it does several jobs at once: it shows possession ("whose?"), marks a completed object, follows postpositions and drives the "have to" construction. Let's see how it's formed and where it turns up.
In short: genitive = the stem of the word + -n. It answers "whose? of what?" and, beyond possession, is needed for the total object and after postpositions. It's one of Finnish's 15 cases — see the overview in The Finnish Partitive Case for the object contrast.
How the genitive is formed
Take the stem of the word and add -n. Many words have a stem that differs from the dictionary form, and consonant gradation often applies: katu → kadun, pankki → pankin.
| Word | Genitive | What changed |
|---|---|---|
| talo (house) | talon | stem unchanged |
| koira (dog) | koiran | stem unchanged |
| katu (street) | kadun | t → d |
| tyttö (girl) | tytön | tt → t |
| pankki (bank) | pankin | kk → k |
| Suomi (Finland) | Suomen | i → e in the stem |
| käsi (hand) | käden | stem käde- |
| nainen (woman) | naisen | -nen → -sen |
| mies (man) | miehen | stem miehe- |
| huone (room) | huoneen | -e → -ee |
The genitive form is essentially the "working" stem of the word: it's what most other case endings attach to. So learning the genitive pays off twice.
When you need the genitive
1. Possession (whose?)
The most obvious job: the word in the genitive comes before what it owns.
| Finnish | English |
|---|---|
| Annan kirja | Anna's book |
| koiran häntä | the dog's tail |
| Suomen kieli | the Finnish language (language of Finland) |
| naapurin auto | the neighbour's car |
2. The total object (completed action)
When an action is finished and covers the object completely, the singular object takes the genitive form (traditionally called the accusative):
- Ostan auton. — I'll buy the car.
- Luen kirjan. — I'll read the (whole) book.
Compare the ongoing action, which takes the partitive: Luen kirjaa — "I'm reading the book" (right now, not finished). This contrast is covered in The Finnish Partitive Case.
3. After postpositions
Most Finnish postpositions govern the genitive: the reference word goes into the genitive and the postposition follows it.
| Finnish | English |
|---|---|
| pöydän alla | under the table |
| talon takana | behind the house |
| oven edessä | in front of the door |
| kokouksen jälkeen | after the meeting |
| minun kanssani | with me |
4. Necessity ("have to")
In necessity constructions (täytyy, pitää, on pakko), the person who must act goes in the genitive and the verb stays in the third person:
- Minun täytyy mennä. — I have to go.
- Sinun pitää odottaa. — You have to wait.
- Hänen on pakko lähteä. — He/she has to leave.
5. Possessive pronouns
"My", "your", "his" are the genitive forms of the personal pronouns: minun (my), sinun (your), hänen (his/her), meidän (our), teidän (your), heidän (their). For example: minun kotini — "my home".
The plural genitive
In the plural there are several endings (-jen, -en, -den/-tten, -ten, -in), and the choice depends on the word type: talojen (of the houses), maiden (of the countries), lasten (of the children), kielten (of the languages), naisten (of the women). Early on it's enough to recognise these; master them actively once the singular is solid.
How to remember the genitive
- Learn the genitive together with the word (katu–kadun, käsi–käden) — this also gives you the "working" stem for the other cases.
- Drill gradation separately: pankki–pankin, tyttö–tytön, silta–sillan.
- Memorise a set of common postpositions (jälkeen, kanssa, takana, alla, edessä) — they almost always take the genitive.
For a step-by-step route from zero to solid grammar, see How long does it take to learn Finnish?.
FAQ
What is the genitive ending in Finnish?
The singular genitive ending is -n, added to the stem of the word: talo → talon, katu → kadun, Suomi → Suomen. The genitive form also serves as the base for many other cases.
How is the genitive different from the partitive?
The genitive marks a completed, fully-covered object (Luen kirjan — I'll read the whole book), while the partitive marks a process or a part (Luen kirjaa — I'm reading the book now). The genitive also shows possession and follows postpositions.
Why is the genitive used for necessity?
In constructions with täytyy, pitää and on pakko, the subject goes in the genitive and the verb stays in the third person: Minun täytyy mennä (I have to go), Sinun pitää odottaa (you have to wait).
Why are possessive pronouns genitive?
The words minun, sinun, hänen, meidän, teidän and heidän are the genitive forms of the personal pronouns, which is why they mean "my, your, his, our, your, their": minun kotini — my home.
Which postpositions take the genitive?
Most of them: jälkeen (after), kanssa (with), takana (behind), alla (under), edessä (in front of), vieressä (next to), vuoksi/takia (because of). The word before the postposition goes in the genitive: kokouksen jälkeen, pöydän alla.