In Ruth and Naomi's final conversation, Naomi expresses cautious faith in a quick resolution. Boaz's inquiry "Who are you?" actually means "What are you? Married or single?" Ruth alters Boaz's words in order to bridge between Naomi and Boaz foreshadowing King David bridging between the tribes of Judah and Benjamin. 

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion