The Partitive Case for Mass Nouns
In English, we make a distinction between "I drink water" (an indefinite amount) and "I drink the water" (a specific, whole amount). When an action is directed at an indefinite quantity of an uncountable thing—a "mass noun" like water, coffee, or ice cream—Finnish uses a special noun form called the partitive case.
To form the partitive, add a suffix to the end of the noun, following the rules of vowel harmony.
| Word Ending | Partitive Ending | Example |
|---|
| Single short vowel | -a / -ä | keitto → keittoa |
| Two vowels or a consonant | -ta / -tä | voi → voita, olut → olutta |
Note: Some older words ending in -i have irregular stems. The word *vesi (water) changes its stem to vet-, making its partitive form vettä.*
Nouns Taking -ta / -tä
When you consume, take, or sell an indefinite amount of something, the object is put into the partitive. Let's look at the partitive endings -ta and -tä in action.
The word lisää means "more". When you ask for or offer more of something, the mass noun that follows must also be in the partitive case.
Nouns Taking -a / -ä
Most mass nouns end in a single short vowel, which means they simply take -a or -ä.
Combining Partitive Objects
When you have multiple mass noun objects in a sentence, every one of them must be in the partitive case. Notice how the short-vowel ending (-a / -ä) and the two-vowel ending (-ta / -tä) look side-by-side.
