Question

Scout is surprised to hear Calpurnia speak in the same black dialect as the others, because at home, Calpurnia always speaks proper English. Jem asks Calpurnia why she doesn't speak with proper grammar around black people, and Calpurnia explains that it would be out of place, and that she would look pretentious. The others don't want to learn to speak the "right" way, she says, so she speaks their language.