człowiekiem

In a sentence

• Jan jest dobrym człowiekiem.

  Jan is a good person.

  Here, 'człowiekiem' is the instrumental case form of 'człowiek' (man/person) used after the verb 'być' (to be) to describe Jan as being a good person.

• Stał się człowiekiem sukcesu.

  He became a successful person.

  In this context, 'człowiekiem' is used to classify or define the type of person someone has become, showing the instrumental case indicating a change in state.

• Rozmawialiśmy z człowiekiem w parku.

  We talked with a man in the park.

  Here, 'człowiekiem' is the instrumental case form of 'człowiek' (man/person), indicating the means or companion of the action 'rozmawialiśmy' (we talked).