żoną

In a sentence

• Moja żona jest bardzo miła.

  My wife is very kind.

  Here, 'żona' is used in the nominative case to refer to one's wife.

• Rozmawiałem z żoną o planach na weekend.

  I talked with my wife about plans for the weekend.

  In this sentence, 'żoną' is used in the instrumental case, as it's accompanied by the preposition 'z', meaning 'with'.

• Chciałbym pomóc żonie w ogrodzie.

  I would like to help my wife in the garden.

  Here, 'żonie' is in the dative case, used to indicate the recipient of the action, 'helping' in this context.