to be upset about something that cannot be changed
расстраиваться из-за того, что уже не изменить (rasstraivatsya iz-za tovo chto uzhe ne izmenit)
"There’s no use crying over spilt milk."
"Бесполезно расстраиваться из-за пролитого молока." (bespolezno rasstraivatsya iz-za prolitovo moloka)
Handle tasks gradually and not all at once.
greater power comes from a larger group
to be open and honest about one’s intentions or feelings
to surprise or impress someone very much
to fight very fiercely or with great determination
Trust what I am saying; believe me.