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CaseSingularPlural
Nominativeименительный · кто? что?сердце сердца the subject: who or what acts
Accusativeвинительный · кого? что?сердце сердца the direct object of the verb
Genitiveродительный · кого? чего?сердца сердец possession, absence, "of"-phrases
Dativeдательный · кому? чему?сердцу сердцам the receiver: to or for someone
Instrumentalтворительный · кем? чем?сердцем сердцами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?сердце сердцах location and topics: in, at, about

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

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

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