An adaptation of the Catechism for Young Children in modern English.
Question: Did Adam only represent himself in the covenant of works?
Answer: No; he also represented all his children.
Question: Did Adam act for himself alone in the covenant of works?
Answer: No; he represented all his posterity.
Word order is changed for clarity and “act for” is changed to “represent” for better symmetry with the answer. Also, “Posterity” is simplified to “children” in keeping with the notion of “first parents”