1)
Why does it say "va'Ya'an" and "va'Yomar"?
1.
Malbim: He said more than he was asked. Since he said that she is Mo'aviyah, he needed to explain that she returned with Na'ami and converted. If not, he should not let a Nochris collect Matanos Aniyim 1 !
2)
What is the tense of "Shavah"?
1.
Rashi: Refer to 1:15:1:1.
3)
What is the significance of "ha'Shavah Im Na'ami"?
1.
Vilna Gaon (5): He praised her in Bo'az' eyes. She abandoned her nation and birthplace in order to cling to Elokei Yisrael