second person singular pronoun vos instead of tú in Spanish.
Vos is used extensively as the primary form of the second person singular in Argentina...
Use the pronoun vos reflecting the informal address in Spanish as opposed to the formal address of usted.
The independent disjunctive pronoun ti is also replaced by vos. That is, vos is both nominative and the form to use after prepositions
Therefore para ti "for you" becomes para vos, etc.
The preposition-pronoun compound contigo "with you" becomes con vos.