There is no point in worrying about past mistakes.
нет смысла переживать о прошлых ошибках. (net smysla perezhivat' o proshlykh oshibkakh.)
"We can’t change the past, so what’s done is done."
"мы не можем изменить прошлое, поэтому что сделано, то сделано." (my ne mozhem izmenit' proshloe, poetomu **chto sdelano, to sdelano**.)
to surprise or shock someone suddenly
to surrender or give up
to be near the end of one’s strength or life
to ignore a problem hoping it will go away
to question someone intensely
to give focused attention to something specific
