nieba

In a sentence

• Patrzę na ptaki szybujące na tle nieba.

  I am looking at the birds gliding against the sky.

  Here, 'nieba' is in the genitive case used as a part of the preposition 'na tle nieba', which means 'against the sky'.

• Nie mam złotego orła z nieba.

  I do not have a golden eagle from the sky.

  In this sentence, 'nieba' is in the genitive case, used to indicate origin, as in 'from the sky'.

• Z okna widzę piękno nieba nocą.

  From the window, I can see the beauty of the sky at night.

  Here, 'nieba' is in the genitive case as part of the phrase 'piękno nieba', meaning 'the beauty of the sky'.