masło

In a sentence

• Masło jest smaczne na chlebie.

  Butter tastes good on bread.

  The word 'masło' is used as the subject of the sentence in its nominative case, denoting the object being discussed.

• Potrzebuję kupić masło ze sklepu.

  I need to buy butter from the store.

  The word 'masło' is in the accusative case, functioning as the direct object of the action described by the verb.

• Czy dodałeś masła do zupy?

  Did you add butter to the soup?

  Here 'masła' is the genitive case, used after verbs that require this case to describe quantity or association.