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CaseSingularPlural
Nominativeименительный · кто? что?прошлый прошлые the subject: who or what acts
Accusativeвинительный · кого? что?прошлый (inanimate) / прошлого (animate) прошлые (inanimate) / прошлых (animate) the direct object of the verb
Genitiveродительный · кого? чего?прошлого прошлых possession, absence, "of"-phrases
Dativeдательный · кому? чему?прошлому прошлым the receiver: to or for someone
Instrumentalтворительный · кем? чем?прошлым прошлыми the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?прошлом прошлых location and topics: in, at, about

Прошлый is an adjective: it copies the gender, number, and case of its noun. The table shows masculine and plural; feminine and neuter follow the same stem with their own endings.

Look up any other word in the Russian declension tool, see where прошлый 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 прошлый and every word like it with typed case endings, checked letter by letter.

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