Situation: You were talking about Maria with someone and you hear somebody approaching. Ask your interlocutor if the person who is coming is Maria.
Interpretation of the utterance: Yes-no question with narrow focus and emphasis
Informator: M. T.
Utterance: Sarè pas Maria, que arriba?
Translation: Isn't it Maria, who is coming?
[Be(future, 3rd sing.) not Maria, that arrives?]