starego

In a sentence

• Widzę szafę starego domu.

  I see a wardrobe of an old house.

  The word "starego" is used as a genitive case adjective modifier agreeing with "domu" in describing an old house.

• Dostałem książkę od starego znajomego.

  I received a book from an old acquaintance.

  Here, "starego" refers to "znajomego", functioning as a genitive case adjective describing an old friend, where "znajomego" is the noun in genitive.

• Znalazłem zdjęcie w starego albumu.

  I found a photo in an old album.

  In this sentence, "starego" modifies "albumu" as a genitive case adjective, referring to the album as being old.