błędów

In a sentence

• Naprawiam błędy w mojej pracy domowej.

  I am correcting errors in my homework.

  The word 'błędów' is used in its genitive plural form as it follows the verb naprawiać, which often takes its object in the genitive when indicating errors or mistakes.

• Unikam błędów podczas rozmowy po angielsku.

  I avoid mistakes when speaking in English.

  Here, 'błędów' is again in the genitive plural form, following the verb unikać, which requires the genitive case for its object.

• Nie mogę się pozbyć tych błędów.

  I cannot get rid of these mistakes.

  In this example, 'błędów' is used in the genitive plural case, following the phrase 'pozbyć się', which governs the genitive case to indicate what is being removed.