sina

In a sentence

• Ovaj poklon je za mog sina.

  This gift is for my son.

  In this sentence, 'sina' is in the accusative case, used to indicate the direct object of the preposition 'za'.

• Sinov maslac od kikirikija je na stolu.

  The son's peanut butter is on the table.

  Here, 'sinov' indicates possession, referring to something that belongs to the son.

• Imam dva sina i jednu kćer.

  I have two sons and one daughter.

  In this instance, 'sina' is in its plural nominative form, used to enumerate the sons as objects owned or possessed.