You already know that a predicative adjective — the one after olla — normally stands in the nominative: Talo on iso. But say Kahvi on kuuma to a Finn about coffee in general and it will sound subtly wrong. The natural sentence is Kahvi on kuumaa, with the adjective in the partitive. This page is about that switch from the adjective's point of view: given a subject, which ending does the predicative adjective take — nominative kuuma or partitive kuumaa? The answer turns entirely on whether the subject is a bounded whole or an unbounded quantity.
The rule from the adjective's side
After olla, the predicative adjective goes into the partitive when the subject is unbounded — a mass, a substance, an abstract quality, or a divisible plural set. It stays nominative only when the subject is a single, countable, bounded thing.
Kahvi on kuumaa, ole varovainen.
The coffee is hot, be careful. (mass subject → partitive kuumaa)
Talo on iso ja valoisa.
The house is big and bright. (bounded singular → nominative iso)
This is the same divisibility logic that governs the partitive object: a bounded whole gets a "total" form, an open-ended quantity gets the partitive. A house has edges; coffee-as-a-substance does not, and the adjective describing it inherits that open-endedness.
Mass and substance subjects → partitive
Anything you measure rather than count — liquids, foods, materials, weather — takes a partitive predicative. Watch the harmony carefully: the double vowel is back -aa or front -ää depending on the adjective's stem.
Vesi on kylmää, en mene uimaan.
The water is cold, I'm not going swimming. (front stem → kylmää)
Maito on hyvää ja tuoretta.
The milk is good and fresh. (hyvää, tuoretta)
Tämä ruoka on liian suolaista.
This food is too salty. (suolaista)
Ilma on aamulla raikasta.
The air is fresh in the morning. (raikasta)
Every one of those adjectives would look different before a countable noun — kylmä juoma, suolainen keitto — but here, describing a substance across the copula, they wear the partitive.
Divisible plural subjects → partitive plural
A plural subject is treated as an open, divisible set, so its predicative goes into the partitive plural — even when the individual things are perfectly countable. This is where the nominative plural is most tempting and most wrong:
Lapset ovat vielä pieniä.
The children are still small.
Nämä omenat ovat todella makeita.
These apples are really sweet.
Naapurit ovat mukavia mutta vähän äänekkäitä.
The neighbours are nice but a bit loud.
Kengät ovat aivan liian kalliita.
The shoes are far too expensive.
The subject lapset, omenat, kengät is nominative plural, yet the predicative is partitive plural: pieniä, makeita, kalliita. The nominative-plural predicative (pienet, makeat, kalliit) is the single most common transfer error at this level.
The minimal pair: the case carries meaning
The nominative/partitive choice is not decoration — it changes what you are saying. Compare a bounded reading with an unbounded one:
| Sentence | Reading |
|---|---|
| Kahvi on kuumaa. | Coffee (the drink, as a substance) is hot. |
| Tämä kahvi on kuuma. | This coffee (this one cup) is a hot one. |
| Suklaa on hyvää. | Chocolate is good (as a food). |
| Tämä suklaa on hyvä. | This (bar of) chocolate is a good one. |
Kahvi on kuumaa — odota, että se jäähtyy.
Coffee is hot — wait for it to cool down. (coffee in general)
Tämä kahvi on kuuma, mutta tuo on jo haalea.
This cup of coffee is hot, but that one is already lukewarm.
Adding a determiner like tämä ("this") bounds the subject into one portion, and the predicative flips to the nominative kuuma. Take the determiner away and speak of the substance, and it returns to kuumaa.
What the partitive here does not mean
A word of warning, because many learner resources get this backwards: the partitive predicative does not mean "some." Kahvi on kuumaa is not "some coffee is hot" — it is a flat general statement, "coffee is hot." The partitive here signals unboundedness of the quality's application, not a partial quantity. English simply has no marking for this — is good covers both hyvä and hyvää — which is exactly why the distinction is invisible to English speakers and has to be learned as a fresh category rather than translated.
Common Mistakes
❌ Kahvi on kuuma.
Wrong for coffee-in-general — a mass subject takes a partitive predicative: kuumaa.
✅ Kahvi on kuumaa.
Coffee is hot.
❌ Vesi on kylmä.
Incorrect — vesi is a mass; the predicative is partitive: kylmää.
✅ Vesi on kylmää.
The water is cold.
❌ Lapset ovat pienet.
Incorrect — a plural subject takes a partitive-plural predicative: pieniä, not the nominative plural pienet.
✅ Lapset ovat pieniä.
The children are small.
❌ Ruoka on tosi hyvä tässä ravintolassa.
Incorrect — ruoka is a mass; describing it, the predicative is partitive: hyvää.
✅ Ruoka on tosi hyvää tässä ravintolassa.
The food is really good in this restaurant.
❌ Nämä kengät ovat kalliit.
Incorrect — plural subject → partitive plural predicative: kalliita.
✅ Nämä kengät ovat kalliita.
These shoes are expensive.
Key Takeaways
- After olla, an unbounded subject (mass, substance, abstract) takes a partitive predicative adjective: kahvi on kuumaa, vesi on kylmää.
- A divisible plural subject takes a partitive-plural predicative: lapset ovat pieniä, omenat ovat makeita.
- A bounded countable singular keeps the nominative: talo on iso, tämä kahvi on kuuma.
- Adding tämä / tuo bounds the subject and flips the predicative to the nominative.
- The partitive here means unbounded, not "some" — a trap in many learner sources.
- Mind the harmony: back -aa (kuumaa), front -ää (kylmää).
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Start learning Finnish→Related Topics
- Attributive vs Predicative PositionA2 — An attributive adjective copies its noun's case (vanhassa talossa); a predicative adjective after olla resets to the nominative (talo on vanha).
- Partitive Predicative: Kahvi on hyvääB1 — With olla, a mass, abstract or plural subject takes a partitive predicate (kahvi on hyvää); a bounded countable singular stays nominative (talo on iso).
- Partitive with Mass and Uncountable NounsA2 — Mass nouns take the partitive for an indefinite amount — ostan maitoa, juon vettä — while the total form (ostan leivän) means a whole, bounded unit.
- Adjective Agreement in Case and NumberA2 — The attributive adjective copies its head noun's case AND number — isossa talossa, pienten lasten, kauniita kukkia — with every stacked adjective agreeing too.