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: T. B. B.

Utterance: Non ei Maria, aquera qu'arribe?

Translation: Isn't it Maria, who is coming?
[Not be(present, 3rd sing.) Maria, that that-arrive(present, 3rd sing.)?]