Relative Pronouns in Polish

In Brief

Polish usually forms a relative clause with który, która, które (“who,” “which,” or “that”). The pronoun agrees in gender and number with the noun it describes, but its case is determined by its role inside the relative clause: kobieta, którą znam (“the woman whom I know”), but kobieta, która przyszła (“the woman who came”). After broad words such as wszystko (“everything”), Polish often uses co and its case forms, especially czego.

Overview

A relative clause is a part of a sentence that describes a person, thing, or idea: “the neighbour who called” or “the film that we watched.” The noun being described is called the antecedent—in plain terms, the word that the relative pronoun points back to. In dom, w którym mieszkam (“the house in which I live”), dom is the antecedent and w którym mieszkam is the relative clause.

At B1, the central skill is learning to connect two facts without repeating the same noun. Instead of To jest dom. Mieszkam w tym domu (“This is a house. I live in this house”), Polish says To jest dom, w którym mieszkam. This requires more attention than English because English “who,” “which,” and “that” change very little. Polish który behaves like an adjective: it changes for gender, number, and case.

The most useful rule is: look left for agreement, but look inside the relative clause for case. The antecedent supplies the pronoun’s gender and number. The verb or preposition inside the relative clause supplies its case. The case of the antecedent in the main clause does not automatically carry over to the pronoun.

How It Works

The basic pattern with który

The structure is:

antecedent + comma + form of który + relative clause

• Znam kobietę, która tu pracuje. — “I know a woman who works here.”
• Znam kobietę, którą tu widziałeś. — “I know the woman whom you saw here.”

In both sentences, the antecedent refers to a feminine singular person, so the pronoun uses a feminine singular form. In the first clause, the woman performs the action, so która is nominative (the case normally used for the subject—the person or thing doing the action). In the second, she receives the action of “seeing,” so którą is accusative (the case often used for the direct object—the person or thing directly affected by the action).

Step 1: Choose gender and number from the antecedent

Antecedent	Basic form	Example
masculine singular	który	student, który pyta
feminine singular	która	książka, która leży
neuter singular	które	dziecko, które śpi
masculine-personal plural	którzy	ludzie, którzy czekają
other plural	które	domy, które stoją

The special plural category masculine-personal means a group grammatically treated as male people, including mixed groups such as studenci or rodzice. Other plural nouns use które in the nominative.

Step 2: Choose case from the relative clause

Temporarily replace the relative pronoun with an ordinary noun phrase. This exposes the case:

• Znam tę kobietę → kobieta, którą znam (accusative)
• Rozmawiam z tym człowiekiem → człowiek, z którym rozmawiam (instrumental)
• Potrzebuję tego dokumentu → dokument, którego potrzebuję (genitive)
• Pomagam tej osobie → osoba, której pomagam (dative)

The instrumental is a case used after certain prepositions and in meanings such as “with”; the genitive often appears after negation, possession, and verbs such as potrzebować; the dative commonly marks a recipient or beneficiary, roughly “to/for someone.” You do not need to guess from the English translation: follow the Polish verb or preposition.

Core declension of który

Case	Masculine singular	Feminine singular	Neuter singular	Masculine-personal plural	Other plural
nominative	który	która	które	którzy	które
genitive	którego	której	którego	których	których
dative	któremu	której	któremu	którym	którym
accusative	którego (animate), który (inanimate)	którą	które	których	które
instrumental	którym	którą	którym	którymi	którymi
locative	którym	której	którym	których	których

There is no separate vocative form needed for this use. The masculine singular accusative follows the familiar animacy split: mężczyzna, którego znam (“the man I know”), but film, który oglądam (“the film I am watching”).

Prepositions stay before the pronoun

English can leave a preposition at the end: “the person I spoke with.” Polish cannot strand it there. Put the required preposition directly before the relative pronoun:

• osoba, z którą rozmawiałem — “the person I spoke with”
• miasto, do którego jedziemy — “the city we are going to”
• pokój, w którym pracuję — “the room I work in”
• temat, o którym czytam — “the topic I am reading about”

The preposition determines the case: z “with” takes instrumental here, do takes genitive, while w and o in these location/topic meanings take locative.

Co and its case forms

Relative co is especially natural after broad or indefinite antecedents such as to (“that/what”), wszystko (“everything”), coś (“something”), nic (“nothing”), and sometimes a whole preceding statement:

• To, co mówisz, jest ważne. — “What you are saying is important.”
• Mam wszystko, czego potrzebuję. — “I have everything I need.”
• Nie ma niczego, o czym moglibyśmy rozmawiać. — “There is nothing we could talk about.”

Although learners often call all of these forms “co,” case still matters. Common forms are co (nominative/accusative in suitable constructions), czego (genitive), czemu (dative), czym (instrumental or locative, with a preposition where required). The concept example Wszystko, co potrzebuję occurs in colloquial usage, but careful standard Polish normally has Wszystko, czego potrzebuję, because potrzebować governs the genitive.

After a specific noun, który is the safest neutral choice. Colloquial speech may use invariant co in sentences such as ten chłopak, co tu pracuje (“that boy who works here”), but this is informal and does not show case. Avoid it in formal writing.

Relative jaki

Jaki also declines like an adjective, but it does not simply replace który. It focuses on kind, quality, or degree, often corresponding to “the kind that,” “such as,” or “what ... like.” It commonly appears with taki (“such/that kind”):

• To nie jest taki problem, jaki mieliśmy wczoraj. — “This is not the same kind of problem as the one we had yesterday.”
• Wybrała sukienkę, jaka jej najbardziej odpowiadała. — “She chose the kind of dress that suited her best.”

Use który when identifying a particular person or thing; use jaki when classifying or describing what kind. In everyday relative clauses, który is far more general.

Commas and word order

Polish normally sets a relative clause off with a comma before the relative word: To jest książka, którą poleciłaś. If the clause interrupts the main sentence, close it with another comma: Książka, którą poleciłaś, była świetna.

The relative pronoun usually comes near the start of its clause, preceded only by its preposition where needed. Polish word order can vary for emphasis, but keeping the antecedent close to its relative clause prevents ambiguity.

Examples in Context

Polish	English	Note
Kobieta, którą znam, jest lekarką.	The woman I know is a doctor.	Feminine accusative: she is the object of znam.
Dom, w którym mieszkam, jest stary.	The house I live in is old.	Masculine locative after w.
Ludzie, którzy przyszli, czekają na zewnątrz.	The people who came are waiting outside.	Masculine-personal nominative.
Film, który oglądamy, trwa dwie godziny.	The film we are watching lasts two hours.	Inanimate masculine accusative has the form który.
To kolega, któremu często pomagam.	This is a colleague whom I often help.	Dative because pomagać takes dative.
Znalazłam dokument, którego szukałam.	I found the document I had been looking for.	Genitive because szukać takes genitive.
To jest osoba, z którą chcę pracować.	This is the person I want to work with.	Instrumental after z meaning “with.”
Pokaż mi zdjęcia, o których mówiłeś.	Show me the photos you talked about.	Plural locative after o.
Dziecko, którego rodzice tu mieszkają, chodzi do tej szkoły.	The child whose parents live here attends this school.	Genitive expresses “whose.”
Mam wszystko, czego potrzebuję.	I have everything I need.	Standard genitive after potrzebować.
To, co zrobiłeś, było odważne.	What you did was brave.	To, co refers to an action or fact.
Nie rozumiem tego, o czym rozmawiają.	I do not understand what they are talking about.	O czym follows the preposition required by rozmawiać o.
Nie był to taki wynik, jakiego oczekiwaliśmy.	It was not the kind of result we expected.	Jaki stresses kind or quality; genitive after oczekiwać.
Warszawa, do której przeprowadzili się rok temu, bardzo im się podoba.	They really like Warsaw, which they moved to a year ago.	Feminine genitive after do.

Common Mistakes

Copying the antecedent’s case

• Wrong: Widzę kobietę, którą tu pracuje.
• Right: Widzę kobietę, która tu pracuje.
• Why: Kobietę is accusative in the main clause, but the woman is the subject of pracuje. The relative pronoun therefore needs nominative która.

Choosing case from the English translation

• Wrong: To dokument, który potrzebuję.
• Right: To dokument, którego potrzebuję.
• Why: English “need” takes a direct object, but Polish potrzebować takes genitive. Polish government—the case required by a verb—wins.

Leaving the preposition at the end

• Wrong: To człowiek, który rozmawiałem z.
• Right: To człowiek, z którym rozmawiałem.
• Why: Polish places the preposition before its object; it cannot imitate English preposition stranding.

Using the wrong plural agreement

• Wrong: Ludzie, które przyszli...
• Right: Ludzie, którzy przyszli...
• Why: A masculine-personal plural antecedent takes nominative którzy. Other plural nouns take które: kobiety, które przyszły.

Using colloquial co in formal prose

• Informal: Facet, co naprawiał rower, już poszedł.
• Neutral/formal: Mężczyzna, który naprawiał rower, już poszedł.
• Why: Invariant co after a specific noun is common in casual speech, but który is the standard all-purpose relative pronoun.

Treating jaki as a free synonym of który

• Unnatural for simple identification: Samochód, jaki stoi przed domem, jest mój.
• Neutral: Samochód, który stoi przed domem, jest mój.
• Why: Który identifies the car. Use jaki when the intended meaning concerns kind or quality, often in correlation with taki.

Usage Notes

In neutral speech and writing, który works for both people and things. Polish does not require separate basic words corresponding to English “who” and “which.” The pronoun’s endings, not a person-versus-thing distinction, carry most of the grammatical information.

English often omits an object relative pronoun: “the book I bought.” Standard Polish normally keeps it: książka, którą kupiłem/kupiłam. English may also use “where” or “when” instead of “in which” or “when”; Polish has relative adverbs such as gdzie and kiedy: miasto, gdzie się poznaliśmy (“the city where we met”), dzień, kiedy wyjechali (“the day when they left”). With a precise prepositional relationship, a form of który is often clearer: firma, w której pracuję.

A relative clause can identify which person or thing you mean, or merely add information. Polish normally uses commas in both types, unlike English, where defining clauses are often written without commas. Do not transfer English comma rules directly.

When speaking, forms of który can feel long, but omitting them is not usually possible. If you lose track of the case, pause and reconstruct the small clause: mieszkam w domu → dom, w którym mieszkam.

Beyond the Basics / Advanced Use

Possession: “whose”

Polish often expresses “whose” with the genitive of który, followed by the possessed noun:

• student, którego siostra studiuje w Krakowie — “the student whose sister studies in Kraków”
• firma, której produkty eksportujemy — “the company whose products we export”

Here którego/której agrees with the possessor—the antecedent—not with siostra or produkty. This pattern can be formal or heavy in a long sentence, but it is standard and useful.

Preposition plus co: o czym, z czym, dzięki czemu

When the antecedent is an idea, event, or the content of a whole clause, Polish often uses a preposition plus a case form of co:

• Odwołali spotkanie, dzięki czemu wróciliśmy wcześniej. — “They cancelled the meeting, thanks to which we returned earlier.”
• Zapomniał hasła, bez czego nie mógł się zalogować. — “He forgot the password, without which he could not log in.”

Especially common are connectors such as dzięki czemu (“thanks to which/as a result”), przez co (“because of which”), and w związku z czym (“in view of which/therefore”). They link not just a noun but the result or consequence of the preceding statement.

Który z... is interrogative, not relative

The same forms can ask “which?”: Który z tych pociągów jedzie do Gdańska? (“Which of these trains goes to Gdańsk?”). That is an interrogative use—a question—not a relative clause. Compare:

• Który pociąg odjeżdża pierwszy? — “Which train leaves first?”
• Pociąg, który odjeżdża pierwszy, jest bezpośredni. — “The train that leaves first is direct.”

Avoiding overloaded sentences

Grammatically correct relative clauses can still become hard to follow when several are nested. Polish formal writing often tolerates dense structures, but clear modern prose usually benefits from splitting them. If a sentence contains repeated który forms with uncertain antecedents, turn one clause into a new sentence or repeat the key noun.

Practice Tips

1. Use the two-question method. For every blank, ask: “What noun does this refer to?” to get gender and number, then “What case would this clause require without the relative pronoun?” to get the ending.
2. Transform sentence pairs. Start with To jest nauczyciel. Rozmawiam z tym nauczycielem. Then combine them: To jest nauczyciel, z którym rozmawiam. Practise one verb or preposition for each case.
3. Build a case phrase bank. Record whole chunks rather than isolated endings: którego potrzebuję, któremu pomagam, z którą pracuję, o których mówię. When listening or reading, underline the antecedent and connect it to the chunk.

Related Concepts

• Prerequisite: Complex Sentences — provides the clause-building foundation needed to combine ideas with relative pronouns.