What do we learn about John and Elizabeth's relationship at the beginning of the act

The conversation between John and Elizabeth Proctor is highly mundane, illustrating the significant tension remaining in the relationship since Proctor's affair with Abigail Williams. Elizabeth Proctor is intensely suspicious of her husband, worrying when he arrives at home late for dinner and adopting a condescending tone when her husband admits that he was momentarily alone with Abigail Williams. Miller establishes Elizabeth Proctor as a morally upright woman, respectable and dignified, yet with an air of superiority that renders her frigid and distant. Proctor feels that Elizabeth has made her home into a repressive atmosphere, continually punishing her husband for his wrongdoing. Still, if Elizabeth adopts a tone of moral superiority it is because she is the superior of her contemporaries, with an unwavering belief in the capability of persons to remain moral.