kotem

In a sentence

• Jestem kotem.

  I am a cat.

  Here, 'kotem' is the instrumental case to indicate the role or identity being referred to.

• Bawię się kotem.

  I am playing with the cat.

  In this sentence, 'kotem' is the instrumental case used to show the means or accompaniment of the action.

• Spaceruję z kotem.

  I am walking with the cat.

  Here, 'kotem' is the instrumental case conveying accompaniment in the activity described.