Some things you cannot count one, two, three: water, sugar, luck. And some things Czech prefers to treat as a single mass even though English sees individual pieces: foliage, firewood, the dishes. This page covers both — mass (uncountable) nouns and collective nouns — because they share one behaviour that surprises English speakers: they stay singular and they are measured, not counted. The grammar of "how much" rather than "how many" runs on the genitive case.
Mass nouns: measure, don't count
A mass noun names a substance with no natural units: voda (water), mléko (milk), cukr (sugar), písek (sand), mouka (flour), sůl (salt), maso (meat), rýže (rice), and abstract ones like štěstí (luck/happiness). You don't ask how many; you ask how much, and you reach for a container or a quantity word. After that word the substance goes into the genitive — the so-called partitive genitive, the case of "a part of."
| Quantity |
| Meaning |
|---|---|---|
| sklenice | vody | a glass of water |
| šálek | kávy | a cup of coffee |
| kousek | chleba | a piece of bread |
| lžíce | cukru | a spoon of sugar |
| trochu | mléka | a bit of milk |
| hodně | štěstí | a lot of luck |
Dej si sklenici vody, vypadáš unaveně.
Have a glass of water, you look tired. (voda → vody, partitive genitive)
Do kávy si dávám jen trochu mléka.
I only take a little milk in my coffee. (mléko → mléka, after trochu)
Kup, prosím tě, kilo cukru a pytlík mouky.
Buy a kilo of sugar and a bag of flour, please. (cukru, mouky — genitive after measures)
Hodně štěstí u zkoušky!
Good luck on the exam! (literally 'a lot of luck' — štěstí, genitive after hodně)
The mechanics of this genitive — which quantity words trigger it and what the endings look like — are laid out in the partitive genitive and the genitive after quantities. The takeaway here is conceptual: a mass noun does not get a number in front of it; it gets a container or amount, and then it sits in the genitive.
A mass noun can go plural, but then the meaning shifts from substance to types or servings of it. Dvě kávy in a café means "two coffees" (two cups); minerální vody are kinds of mineral water; piva are glasses or brands of beer. The plural counts portions, not the stuff itself.
Dvě kávy a jednu minerálku, prosím.
Two coffees and one sparkling water, please. (kávy = two servings, not 'two waters of substance')
English plurals that are Czech singulars
Watch for nouns English makes plural but Czech keeps resolutely singular. Zelenina (vegetables) and ovoce (fruit) are the classic traps: both are singular in Czech, so the verb is singular and you can't say "vegetables are."
Zelenina je zdravá, jez jí víc.
Vegetables are healthy, eat more of them. (zelenina je — singular feminine)
Ovoce máme v míse na stole.
We've got fruit in the bowl on the table. (ovoce, singular neuter)
Collective nouns in -í
Czech has a beautiful little machine for turning a countable thing into a single collective mass: take the noun and wrap it in the neuter ending -í. The result is grammatically singular even though it names many items, and it always agrees in the singular. These collectives follow the soft neuter stavení pattern.
| Countable unit | Collective (-í, singular) | Gloss |
|---|---|---|
| list (leaf, sheet) → listy | listí | foliage, the leaves |
| kámen (stone) → kameny | kamení | stones, rubble |
| dřevo (wood) → — | dříví | firewood, cut wood |
| — | nádobí | the dishes, crockery |
| — | uhlí | coal |
The defining trait is singular agreement. The leaves are falling, but listí padá — third-person singular. The dishes are dirty, but nádobí je špinavé — singular je, neuter adjective špinavé.
Na podzim padá listí a všude ho je plno.
In autumn the leaves fall and there's loads of it everywhere. (listí padá — singular verb, singular ho 'it')
Musím ještě umýt nádobí a pověsit prádlo.
I still have to wash the dishes and hang up the laundry. (nádobí, prádlo — both singular)
Na cestě leželo spadané kamení.
Fallen stones were lying on the path. (kamení leželo — neuter singular past)
Na zimu jsme si nachystali dříví.
We got firewood ready for the winter. (dříví, collective singular)
Collective versus countable plural
The same root often gives you both options, and they are not interchangeable. The -í collective names the mass; the ordinary plural names individuals you could point at.
- listí = foliage as a whole; listy = individual leaves or sheets (listy papíru, sheets of paper).
- kamení = stones/rubble as a heap; kameny = particular stones you could pick up and count.
- dříví = firewood collectively; dřevo = wood as a material (timber).
Vyhrabal jsem ze zahrady plnou káru listí.
I raked a whole cartful of leaves out of the garden. (listí, the mass)
Do herbáře si nalepila tři listy javoru.
She glued three maple leaves into her herbarium. (listy, three individual leaves you can count)
Děti házely do potoka kameny.
The kids were throwing stones into the stream. (kameny — individual stones, countable)
Common mistakes
❌ Listí padají na zem.
Incorrect — listí is singular, so the verb must be singular: padá.
✅ Listí padá na zem.
The leaves are falling to the ground. (singular padá)
❌ Nádobí jsou špinavé, umyj je.
Incorrect — nádobí is a singular collective: je špinavé, umyj ho.
✅ Nádobí je špinavé, umyj ho.
The dishes are dirty, wash them. (singular agreement)
❌ Můžu dostat vodu? Chci dvě vody bez bublin.
Possible in a café (= two servings), but for the substance you measure it: a glass of water = sklenice vody.
✅ Dáte mi sklenici vody?
Could I have a glass of water? (sklenice vody, partitive genitive)
❌ Zelenina jsou důležité pro zdraví.
Incorrect — zelenina is singular feminine in Czech: je důležitá.
✅ Zelenina je důležitá pro zdraví.
Vegetables are important for your health. (singular)
❌ Kup trochu chléb.
Incorrect — after a quantity word the noun goes into the partitive genitive: trochu chleba.
✅ Kup trochu chleba.
Buy a bit of bread. (chléb → chleba, genitive)
Key takeaways
- Mass nouns (voda, cukr, mléko, štěstí) are measured, not counted: a container or quantity word + the partitive genitive (sklenice vody, trochu cukru).
- A mass noun in the plural means types or servings (dvě kávy = two coffees), not the substance.
- Collective nouns in -í (listí, kamení, dříví, nádobí, uhlí) are grammatically singular despite naming many things: listí padá, nádobí je špinavé.
- The -í collective (the mass) contrasts with the ordinary plural (countable individuals): listí vs listy, kamení vs kameny.
- Beware English plurals that are Czech singulars: ovoce, zelenina.
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Start learning Czech→Related Topics
- The Partitive GenitiveA2 — Why a container, measure or portion forces the substance it holds into the genitive — sklenice vody, kilo masa, šálek kávy — with no word for 'of'.
- The Genitive After Quantity WordsA2 — How indefinite quantity words like mnoho, málo and trochu force the counted noun into the genitive.
- Singular and Plural in CzechA1 — Czech has singular and plural, but there's no single plural marker like English -s — the plural form depends on gender, paradigm, and case.
- Neuter: The Stavení Paradigm (-í neuters)B1 — The invariable-looking -í neuter declension, including the productive verbal-noun class.
- Plural-Only Nouns (Pluralia Tantum)A2 — Nouns that exist only in the plural and how to count and agree with them.