Genitive: Partitive and Dates

You already know the genitive for "of," possession, and absence. This page adds two more of its jobs — and both fill gaps English plugs with extra words. The partitive genitive lets Ukrainian say "some of" with case alone, drawing a line between drinking the water and drinking some water that English can only make with the word "some." And dates put the ordinal day and the month name both in the genitive, with no preposition for "on": "on the first of September" is simply пе́ршого ве́ресня. Neither use is hard once you see the logic, but both are easy to miss because English does not signal them by case. For the genitive endings themselves, lean on the genitive forms page.

Part 1 — The partitive genitive: "some of"

The core idea: genitive = a part, accusative = the whole

With mass nouns — water, tea, sugar, bread, soup — Ukrainian can mark whether you mean an indefinite portion ("some") or the whole, definite quantity ("the X"). The portion goes in the genitive; the whole goes in the accusative. This is the partitive genitive (родо́вий партити́вний), and it is most alive after verbs of giving, taking, pouring, buying, and eating/drinking.

Why the genitive means "part"

The logic threads straight back to the genitive's core sense of "of." "Some water" is literally "(some) of water" — you take a quantity out of the mass. The genitive has always marked that out-of-a-whole relationship (a page of a book, a kilo of sugar), so extending it to "a drink of water" is the same idea. Once you feel the genitive as "out of the larger amount," the partitive stops being a separate rule and becomes an obvious application.

The partitive -у on masculine mass nouns

Many masculine mass nouns already take -у in the genitive (цу́кру, ча́ю, су́пу, сні́гу — see the masculine -а/-у split), and that same -у form serves as the partitive. So дай ча́ю "give some tea," нали́й со́ку "pour some juice," ви́пив ква́су "drank some kvass." There is nothing extra to learn here — the genitive you already know is the partitive.

Negation overlaps with the partitive

A related habit: under negation, the direct object of a transitive verb very often shifts to the genitive — and with mass nouns this blends seamlessly into the partitive feel.

Here ка́ви is genitive after the negated пив, and it also reads partitively ("any coffee"). The two uses reinforce each other; the full story of object-genitive choices is on the genitive-vs-accusative objects page.

Part 2 — Dates in the genitive

The day and month: ordinal + month, both genitive, no "on"

To say on what day something happens, Ukrainian puts the ordinal number (first, second, third…) and the month name both in the genitive, with no preposition for English "on." The day is literally "(of) the first (of) September."

The ordinal agrees with an understood neuter noun число́ ("date/number"), which is why it ends in -ого: пе́ршого, во́сьмого. In compound numbers only the last part is the ordinal and inflects — два́дцять четве́ртого (twenty stays as is, четвертого carries the genitive). The month name takes its ordinary masculine genitive: ве́ресень → ве́ресня, бе́резень → бе́резня, се́рпень → се́рпня.

Asking the date: яко́го числа́?

The question "on what date?" is яко́го числа́? — itself in the genitive, since число́ "date" is what the ordinals modify. To say "on the Nth" without naming the month, use N-ого числа́:

The year: locative for "in 199X," genitive inside a full date

A common point of confusion. The year on its own — "in 1991" — uses the locative: у 1991 ро́ці ("in the 1991st year"), where ро́ці is locative and the year is read as an ordinal (ти́сяча де́в’ять сот де́в’яносто пе́ршому). But when you give a full date, the trailing ро́ку ("of the year") goes in the genitive, matching the genitive day and month.

A date-writing drill

Work through these, building each from the pieces — ordinal day (genitive -ого) + month (genitive) + optional ро́ку (genitive):

Source-language comparison

For an English speaker, the two takeaways are distinct but both about case doing a word's job. First, the partitive: English needs "some" to say "drank some water" — Ukrainian does it with the genitive ending alone (ви́пив води́), and reserves the accusative (ви́пив во́ду) for "the water." The closest English instinct is the count/mass feel of "I'd like (some) tea," but Ukrainian grammaticalises it. Second, dates: English says "on the first of September" with both "on" and "of"; Ukrainian drops "on" entirely and just puts the ordinal in the genitive — пе́ршого ве́ресня — so the very form of "first" announces it is a date. There is no separate word for "on."

For a Russian speaker, both constructions are familiar in shape — Russian also has the partitive (вы́пил воды́) and the genitive date (пе́рвого сентября́). The differences are in the forms: the Ukrainian month names (ве́ресня, бе́резня, тра́вня — Ukraine's own calendar words, unlike Russian's Latin-derived сентября́, ма́я), and the spelling of the ordinals. The grammar transfers; relearn the month vocabulary, which is one of the clearest lexical dividing lines between the two languages.

Common Mistakes

Key Takeaways

• The partitive genitive marks an indefinite portion of a mass noun: нали́й води́, купи́ цу́кру, пої́в су́пу — "some water/sugar/soup."
• Case alone distinguishes part from whole: ви́пив води́ "drank some water" (genitive) vs ви́пив во́ду "drank the water" (accusative) — no "some" needed.
• The partitive logic is the genitive's "out of a whole" sense; masculine -у forms (ча́ю, су́пу, сні́гу) double as partitives.
• Dates put the ordinal day and the month both in the genitive, with no "on": пе́ршого ве́ресня, во́сьмого бе́резня; ask with яко́го числа́?
• The year alone is locative (у 1991 ро́ці) but inside a full date the year is genitive (тре́тього се́рпня 2024 ро́ку).