Did not Monsieur Lawrence make the sour face every time Mademoiselle Cynthia spoke and laughed with his brother? 
Lawrence smiled every time Mademoiselle Cynthia spoke to his brother.
mnli hypothesis: Lawrence smiled every time Mademoiselle Cynthia spoke to his brother. premise: Did not Monsieur Lawrence make the sour face every time Mademoiselle Cynthia spoke and laughed with his brother? 