Anglais example sentences with "be a thing"

Maybe it's time to let this be a thing of the past.
Translate from Anglais to Espagnol

For some half-hour he tried to comfort himself with an idea that he could get hold of Captain Marrable and maul him; that it would be a thing permissible for him, a magistrate, to go forth with a whip and flog the man, and then perhaps shoot him, because the man had been fortunate in love where he had been unfortunate.
Translate from Anglais to Espagnol