1)
Why did he say "Chatanu v'Avinu"?
1.
Malbim: Sin can block the good promises for us. Chet is due to desire; Avon is due to crooked intellect and denial.
2)
Why did he add "v'Hirshanu u'Maradnu"?
1.
Malbim: Hirshanu includes sins Bein Adam l'Chavero. Maradnu ? it was not amidst desire, rather, in order to rebel.
3)
What is the meaning of "v'Sor mi'Mitzvosecha [umi'Mishpatecha]"?
1.
Rashi: We veered from Your Mitzvos. Malbim ? Mitzvosecha are Bein Adam l'Makom. Mishpatecha are Bein Adam l'Chavero.
