Why did he say "mi'Ymei Avoseinu"?
Malbim: The liability for punishment was already from the days of our fathers. Their measure [of sin] was filled; we were obligated punishment until today.
What is the meaning of "Nitanu"?
Rashi: We were given. It should say Nitanenu; the Dagesh in the Nun is in place of the missing Nun. This is like "v'Nasanu Es Benoseinu."
Why does it say "keha'Yom ha'Zeh"?
Rashi: It is like we appear today, that the 10 tribes were exiled, and many of the exiles remain in Bavel.
Malbim: Due to liability for our sins, the Ketz of salvation has not come. The angel revealed to Daniel (9:24) "Shavu'im Shiv'im Nechtach Al Amecha" - the return of Yisrael in Bayis Sheni was only temporary grace. They still need cleansing from their sins.
