'Finders, keepers; losers, weepers' is not a valid excuse for keeping someone else's property.
'Znalezione nie kradzione' nie jest dobrym usprawiedliwieniem dla zatrzymywania cudzej własności.
A valid excuse is necessary to avoid penalties for missing the deadline.
His valid excuse for the delay satisfied the manager's concerns.
A late submission can sometimes be forgiven if accompanied by a valid excuse.
Everyone understood when he presented his valid excuse regarding the missed deadline.
His valid excuse convinced the teacher to allow him extra time on the project.
A valid excuse might protect you from negative feedback at work.
His valid excuse helped him avoid a fine for missing the appointment.
He couldn't find a valid excuse to explain why he failed the test.
I hope my travel plans can count as a valid excuse.
His explanation was a valid excuse in the eyes of the court.
Her illness was a valid excuse for not attending the event.
Having a valid excuse can sometimes make a difficult situation easier.