ojca

In a sentence

• Odwiedziłem mojego ojca w szpitalu.

  I visited my father in the hospital.

  Here, 'ojca' is in the accusative case as it is the direct object of the verb 'visited' ('odwiedziłem').

• To jest dom mojego ojca.

  This is my father's house.

  In this sentence, 'ojca' is in the genitive case, showing possession ('my father's').

• Nie widziałem ojca od tygodnia.

  I haven't seen my father for a week.

  Here, 'ojca' is in the genitive case because it is used with the negative verb 'haven't seen' ('nie widziałem').