viņu

In a sentence

• Es redzēju viņu parkā.

  I saw him/her in the park.

  In this sentence, 'viņu' functions as a third-person singular masculine or feminine pronoun in the accusative case, used to refer to a person as the direct object.

• Mēs apmeklēsim viņu nākamnedēļ.

  We will visit them next week.

  Here, 'viņu' is used as a third-person plural pronoun in the accusative case, indicating them as the direct object of the verb.

• Šī ir viņu grāmata.

  This is their book.

  In this example, 'viņu' acts as a third-person plural possessive pronoun, describing ownership of the book.