worków

In a sentence

• Wyjęliśmy ziemniaki z worków.

  We took potatoes out of the sacks.

  Here, "worków" is the plural genitive form of the word "worek" and is used to indicate possession or association, essentially "of the sacks."

• Zabrakło worków na piasek.

  There weren't enough sacks for sand.

  In this sentence, "worków" functions as the plural genitive form, showing that the number of an item, in this case sand, is in relation to sacks.

• Trzymali w piwnicy kilka worków ze zbożem.

  They kept several sacks of grain in the basement.

  In this usage, "worków" again acts as the plural genitive form to specify the sacks containing grain.