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CaseSingularPlural
Nominativeименительный · кто? что?срок сроки the subject: who or what acts
Accusativeвинительный · кого? что?срок сроки the direct object of the verb
Genitiveродительный · кого? чего?срока сроков possession, absence, "of"-phrases
Dativeдательный · кому? чему?сроку срокам the receiver: to or for someone
Instrumentalтворительный · кем? чем?сроком сроками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?сроке сроках location and topics: in, at, about

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

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

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