pierwszy

In a sentence

• To jest mój pierwszy dom.

  This is my first house.

  Here, 'pierwszy' is used in its adjective form to describe the ordinal number position of the noun 'dom' (house).

• Zawsze chcę być pierwszy w zawodach.

  I always want to be first in competitions.

  'Pierwszy' works as an ordinal adjective in comparison within a ranking framework, emphasizing priority.

• Byłeś pierwszym, który mi pomógł.

  You were the first to help me.

  In this example, 'pierwszym' takes the instrumental case form to fit the grammatical structure of being 'the first one' associated with the individual in question.