Questions & Answers about Після уроку я ховаю зошит у рюкзак.
Because після always takes the genitive case.
- урок = nominative singular
- уроку = genitive singular
So після уроку means after the lesson / after class.
Зошит is the direct object of the verb ховаю, so it is in the accusative case.
For masculine inanimate nouns in the singular, the accusative looks the same as the nominative:
- nominative: зошит
- accusative: зошит
So even though it is accusative here, the form does not visibly change.