boiska

In a sentence

• Dzieci bawią się na boisku.

  The children are playing on the sports field.

  Here, 'boisko' is in the locative case 'boisku', indicating the location where the action takes place.

• Zachwyciła mnie przestronność nowego boiska.

  I was impressed by the spaciousness of the new sports field.

  In this sentence, 'boiska' is in the genitive case, used to describe a property or characteristic of something, here referencing the sports field.

• Zbudowano już trzy nowe boiska w naszej dzielnicy.

  Three new sports fields have already been built in our neighborhood.

  Here, 'boiska' is in the plural form in nominative/accusative case, used to mention the number and existence of new sports fields.