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