Genitive Case

The Genitive case (Dopełniacz) is incredibly versatile and impossible to avoid in everyday Polish. Here are its main functions:

• Possession: It shows ownership or relationship, replacing the English "of" or "'s" (e.g., książka brata = brother's book).
• Negation: If a verb normally takes an Accusative object, negating that verb forces the object into the Genitive (e.g., Mam wodę → Nie mam wody).
• Absence: The phrase nie ma (there is no / is not here) always requires the Genitive.
• Prepositions: It is required after many common prepositions like do (to), z (from/out of), bez (without), and dla (for).
• Quantities and Dates: Used to express "some" of a mass noun, after indefinite quantifiers (dużo, mało, ile), or after numbers 5 and above. Note that compound numbers ending in 2, 3, or 4 (like 22 or 34, but not 12-14) take the Nominative/Accusative for non-masculine-personal nouns. For masculine personal nouns, these compound numeral phrases use forms such as dwudziestu dwóch mężczyzn, with the noun in genitive plural. Do not extend simple dwaj mężczyźni mechanically to a compound dwudziestu dwaj mężczyźni. This rule describes nominative/accusative numeral phrases; other cases decline according to their own pattern. It is also used for dates, where an event’s date uses a genitive ordinal day and genitive month (e.g., pierwszego maja).
• Specific Verbs: Some verbs, like szukać (to look for), słuchać (to listen to), potrzebować (to need), and uczyć się (to learn/study), require the Genitive instead of the Accusative.

Singular Endings:
Most animate masculine nouns (people and animals) take -a (e.g., brata, psa, kota), but masculine nouns ending in -a in the Nominative (like mężczyzna or kolega) decline like feminine nouns, taking -y or -i. For inanimate masculine nouns, the ending is either -a (often for fruits, months, tools) or -u (often for abstract concepts, liquids, days of the week). Feminine nouns take -y or -i, including consonant-ending nouns: noc → nocy (night), rzecz → rzeczy (thing), miłość → miłości (love). Most neuter nouns take -a, but nouns ending in -um do not change, and those ending in -ę take -enia or -ęcia.

Plural Endings:
Masculine nouns typically take -ów, -y, or -i. Many feminine and neuter nouns take a zero ending (dropping the final vowel). Some nouns have a mobile -e- in this form; learn it with the noun rather than inserting it into every cluster (e.g., matka → matek, okno → okien). However, there are exceptions: feminine nouns ending in a consonant take -y or -i, neuter nouns ending in -um take -ów, and the vast majority of neuter nouns ending in -e (like mieszkanie or morze) take a zero ending.

Adjectives:
Adjectives take -ego for masculine and neuter nouns, and -ej for feminine nouns in the singular. In the plural, all adjectives take -ych or -ich.

A calendar statement can instead use a nominative day: Dziś jest pierwszy maja (Today is May first). The event-date answer is Spotkamy się pierwszego maja (We will meet on May first); maja remains genitive in both.