Dopełniacz
the case of “of”

Polish marks the role of a noun with an ending, not with word order. Dopełniacz is the case that answers kogo? czego? — literally “of whom? of what?”. Its name comes from dopełniać, “to complete”: it completes another word — a noun, a verb, an adjective, a numeral — by naming the thing that word is about.

The seven cases, for orientation

You have already met 5 and 3. The genitive is the case that most often looks like the accusative — for masculine animates the two are identical — so that overlap is the one to watch.

Every genitive you will ever produce belongs to one of these six patterns. Recognise the pattern, and the ending follows far more easily than by guessing.

Two refinements worth knowing early

Genitive of time. Dates and clock-like time expressions stand in the genitive when they have a modifier: pierwszego maja, trzeciego stycznia, tego dnia, zeszłego roku, następnego tygodnia. Today’s date is a genitive: dwudziestego ósmego października.

Subjective vs objective genitive. śpiew ptaków — the birds sing (subject); obrona miasta — the city is defended (object). The same ending carries both directions; context decides, exactly as English “the shooting of the hunters” does.

Four endings, distributed by gender and by the final consonant of the stem. This table is the whole system in miniature.

-y or -i? The consonant decides

Feminine nouns (and masculine nouns in -a) take -i after soft stems and after k, g, l; -y after everything hard, including the “hardened” sounds c, cz, dz, dż, rz, sz, ż.

Masculine in -a: the “false feminine” group

Words like mężczyzna (man), kolega (colleague), poeta, kierowca (driver), starosta, tata are grammatically masculine but decline like feminines.

mężczyzna → mężczyzny · kolega → kolegi · kierowca → kierowcy · poeta → poety

Adjectives and pronouns follow the same map

So: dobry student → dobrego studenta, dobra książka → dobrej książki, dobre dzieci → dobrych dzieci.

For masculine inanimate nouns there is no rule that predicts the ending with certainty — the choice is lexical and partly historical. But it is not random either: PWN describes clear semantic tendencies, and a learner who knows them guesses right far more often than chance. Learn the tendencies, then memorise the frequent nouns.

When the ending changes the meaning

Two nouns are famous for it, and examiners love them:

The plural genitive is the single most used form in Polish after the nominative — it appears after every number from five up. It has four outcomes: -ów, -y, -i, or no ending at all.

The fleeting -e-

Where the ending disappears, Polish often inserts -e- to keep the word pronounceable. It happens mostly after clusters of consonants:

książka → książek · okno → okien · jabłko → jabłek · siostra → sióstr · matka → matek · córka → córek

Irregulars you will use constantly

This is the single most useful application of the genitive plural, and the one learners get wrong most often — because Polish changes strategy at five.

The rule: the last element of the number decides. 12, 13, 14 behave like 5 — dwanaście lat, never “dwanaście lata”.

Masculine-personal nouns take a special numeral

When the noun is a man or a group including men, the numeral itself has a different genitive form, and even 2–4 switches to the genitive:

So “five students” is pięciu studentów, never “pięć studentów”. Compare pięć kotów — a cat is not masculine-personal.

Quantity words that always demand the genitive

półtora goes with masculine and neuter nouns, półtorej with feminine ones — both take the genitive singular.

Collective numerals

For mixed groups, children, and young animals Polish uses dwoje, troje, czworo, pięcioro + genitive plural:

dwoje dzieci · troje ludzi · pięcioro kurcząt

Their own genitive is -a: pięciorga dzieci — “of five children”.

Several dozen Polish verbs govern the genitive as their direct object. They cluster into recognisable meanings — and the clusters are the memory hook.

The logic behind the list

PWN groups these verbs by meaning, and the grouping is genuinely predictive:

• Negation-like meaning — brakować, odmawiać, zabraniać, zaprzestać, zaniechać, zapomnieć: each can be paraphrased with “not”. The genitive is the case of absence, so it fits.
• Multi-stage or partial action — bronić, dochodzić, doczekać się, dostarczać, pilnować: you deal with part of a process, not a completed object.
• Wish, demand, expectation — chcieć, pragnąć, żądać, wymagać, oczekiwać, życzyć: what you want is not yet “there”, so again the case of non-existence.

That is why chcę kawy (a part, some coffee) differs from chcę kawę (the whole cup, accusative). Both are correct; the genitive makes it partial.

Verbs whose object changes the meaning

Verbs that look genitive but are not

This is the most mechanical part of the case — a closed list. Learn it once and it never changes.

The four that look genitive and are not

“z” means two different cases

z + genitive = from, out of. z + instrumental = with, together with.

Wracam z pracy. — I’m coming back from work.

Kawa z mlekiem. — Coffee with milk.

Noun + noun: the prepositional alternative

Polish often prefers a bare genitive where English needs a phrase, but a prepositional version usually exists too:

klucz do samochodu ǁ klucz samochodu · okazja zobaczenia wystawy ǁ okazja do zobaczenia wystawy

The rule is short and, in standard Polish, reliable: a negated verb that would take an accusative object takes a genitive object instead.

“nie ma” and “nie było”

Existence negated is always genitive — this is the construction you will use most in real life:

Nie ma mleka. · Nie ma problemu. · Nie ma nikogo. · Nie było czasu. · Nie będzie egzaminu.

When the rule does not apply

• The verb already governs another case. Pomagam mamie → Nie pomagam mamie (dative stays). Interesuję się historią → Nie interesuję się historią (instrumental stays).
• “być” with a predicate noun. Jestem nauczycielem → Nie jestem nauczycielem (instrumental stays).
• “to jest / to nie jest”. To nie jest mój samochód — nominative, because there is no accusative object at all.
• The object sits behind a preposition. Mówię o tobie → Nie mówię o tobie (locative stays).
• The negated word is the subject, not the object. Nikt nie przyszedł — nominative subject.

Pronouns under negation

The object pronoun also switches: Mam go → Nie mam go; Widzę ją → Nie widzę jej; Znam to → Nie znam tego.

Masculine go looks identical because the accusative and genitive of on coincide. Feminine and neuter show the change clearly.

Possessives and demonstratives

jego, jej, ich do not decline: samochód jego ojca, książka jej siostry.

Adjectives with the genitive

A small set of adjectives governs the genitive directly — worth recognising, easy to use:

8 sets, 191 items. Every answer comes with the reason: 1–9 to pick an option, Enter to check or continue. Your misses are collected, and “Review the mistakes” runs only those. Progress is saved on this device.

Every form below was checked against the declension tables of Polish Wiktionary and, where relevant, the PWN language clinic. Type to filter by noun, ending, or gender.

Endings

The four rules that cover most real sentences

1. Negated verb → accusative becomes genitive. Nie mam czasu.
2. 5 and above, and quantity words → genitive plural. pięć książek, dużo pracy.
3. Genitive prepositions → do, od, z, u, bez, dla, oprócz, koło, około, obok, podczas, według, wobec, zamiast, pomimo, w ciągu, z powodu.
4. Verb + genitive → szukać, uczyć się, bać się, potrzebować, używać, słuchać, pilnować, wymagać, oczekiwać, życzyć, brakuje.

Say it out loud, ten times

Nie mam czasu. · Nie ma mleka. · Szukam mieszkania. · Uczę się polskiego. · Pięć książek. · Szklanka wody. · Do sklepu. · Bez cukru. · Boję się ciemności. · Według mnie.