liści

In a sentence

• Na drzewie jest dużo zielonych liści.

  There are many green leaves on the tree.

  Here, 'liści' is used to refer to 'leaves' in the locative case because it follows the preposition 'na' combined with a statement of location.

• Zbieram kolorowe liście z ziemi.

  I am collecting colorful leaves from the ground.

  In this sentence, 'liście' is in the accusative case as it is the direct object of the action 'zbieram' (I am collecting).

• Zapach palonych liści jesienią jest niezapomniany.

  The smell of burning leaves in autumn is unforgettable.

  Here, 'liści' is in the genitive case, which is dictated by the noun 'zapach' (smell), often requiring the complementary noun to take this case.