Why did they say "Anachnu Ma'alnu"? Below, it lists those who married Nochriyos - they are a small minority!
Malbim: Even so, it was a sin of the Klal, for it was done publicly, and the Sarim did not protest - "v'Yad ha'Sarim veha'Seganim Hayah ba'Ma'al ha'Zeh Rishonah" (9:2). Therefore it is considered a sin of the nation, due to Arvus (mutual responsibility), and Shechanyah included himself.
What is the meaning of "va'Noshev"?
Rashi: We returned.
Is "Yesh Mikveh" a question?
Rashi: Yes. Is there hope 1 that Yisrael can expel their Nochri wives and the children born from them?
Malbim: No. There is hope - if they will accept to protest, the sin will depart. Before they could not protest, for the king had not empowered them to punish and enforce Torah law. Now Ezra was empowered to appoint judges and officers to punish transgressors - "Hen l'Mos Hen Lishroshi" (7:26). Now the Me'ilah takes effect on all, if they do not protest.
Ibn Ezra: It should say ha'Yesh Mikveh; the prefix Hei is omitted.
