Use commas and sabe lives 😆. Proper comma placement is extremely important in certain languages such as English and Portuguese. In fact, it is an extremely sensitive issue. Doing it incorrectly can change the entire meaning of a sentence! *Use commas to isolate the vocative* Vocative means “the person you are calling”. If you want to call someone’s "Joana, traz-me esse documento." "Sofia, vai comprar cenouras." “Ó Deus, valei-nos!”