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CaseSingularPlural
Nominativeименительный · кто? что?автобус автобусы the subject: who or what acts
Accusativeвинительный · кого? что?автобус автобусы the direct object of the verb
Genitiveродительный · кого? чего?автобуса автобусов possession, absence, "of"-phrases
Dativeдательный · кому? чему?автобусу автобусам the receiver: to or for someone
Instrumentalтворительный · кем? чем?автобусом автобусами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?автобусе автобусах location and topics: in, at, about

Автобус 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 автобус 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 автобус and every word like it with typed case endings, checked letter by letter.

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