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CaseSingularPlural
Nominativeименительный · кто? что?пятница пятницы the subject: who or what acts
Accusativeвинительный · кого? что?пятницу пятницы the direct object of the verb
Genitiveродительный · кого? чего?пятницы пятниц possession, absence, "of"-phrases
Dativeдательный · кому? чему?пятнице пятницам the receiver: to or for someone
Instrumentalтворительный · кем? чем?пятницей пятницами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?пятнице пятницах location and topics: in, at, about

Пятница is a feminine noun; the ending pattern above repeats across most feminine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where пятница ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills пятница and every word like it with typed case endings, checked letter by letter.

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