Here is the rule for the Accusative case of the singular forms of #-declension and o-declension nouns.
The Accusative Singular of #-declension and o-declension inanimate nouns is the same as the Nominative.
The above rule doesn't cover nouns that refer to animate beings, like преподавђтель 'instructor,' студљнт 'undergraduate student', etc. See also the Accusative forms of a-declension nouns. Accusative Singular ending for all ь-declension nouns is the same as their Nominative ending. Accusative Plural endings for all declensions depend on animacy.
#-decl. Ћн передђл стакђн. (Nom. стакђн) He passed the glass.
o-decl. Ћн передђл яйцћ. (Nom. яйцћ) He passed the egg.
a-decl. Ћн передђл икрџ. (Nom. икрђ) He passed the caviar.
The Accusative Singular case ending for all ь-declension nouns is the same as their Nominative ending (for animate and inanimate nouns alike). The Accusative case ending for the singular forms of a-declension nouns is -у (-ю).
One of the functions of the Accusative case is to be the direct object of a verb. Here are a few verbs that take direct objects in the Accusative case:
взїть знђть повторќть расслІшать
вќдеть открІть понимђть слџшать
дђть перевестќ попросќть спросќть
закрІть передђть предстђвить учќть
звђть писђть прочитђть читђть