ucznia

In a sentence

• Widzę ucznia w klasie

  I see a student in the class

  Here, 'ucznia' is the accusative singular form of 'uczeń', correctly used as the direct object of the verb 'widzę'.

• Podszedłem do ucznia i zapytałem o zadanie

  I approached the student and asked about the homework

  In this sentence, 'ucznia' again is in the accusative case, functioning as the direct object of the phrase 'Podszedłem do'.

• Nie znam dobrze tego ucznia

  I don't know this student well

  Here, 'ucznia' is part of a negative sentence and remains in the accusative case as per the grammatical rule in Polish where the accusative changes to the genitive in negative contexts involving direct objects.