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CaseSingularPlural
Nominativeименительный · кто? что?небо небеса the subject: who or what acts
Accusativeвинительный · кого? что?небо небеса the direct object of the verb
Genitiveродительный · кого? чего?неба небес possession, absence, "of"-phrases
Dativeдательный · кому? чему?небу небесам the receiver: to or for someone
Instrumentalтворительный · кем? чем?небом небесами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?небе небесах location and topics: in, at, about

Небо 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 небо 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 небо and every word like it with typed case endings, checked letter by letter.

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