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CaseSingularPlural
Nominativeименительный · кто? что?сон сны the subject: who or what acts
Accusativeвинительный · кого? что?сон сны the direct object of the verb
Genitiveродительный · кого? чего?сна снов possession, absence, "of"-phrases
Dativeдательный · кому? чему?сну снам the receiver: to or for someone
Instrumentalтворительный · кем? чем?сном снами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?сне снах location and topics: in, at, about

Сон 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 сон 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 сон and every word like it with typed case endings, checked letter by letter.

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