Questão 1135796

Read the following excerpt from Mark Twain's The Adventures of Tom Sawyer (1876):

"His aunt Polly stood surprised a moment, and then broke into a gentle laugh. 'Hang the boy, can't I never learn anything? Ain't he played me tricks enough like that for me to be looking out for him by this time ? But old fools is the biggest fools there is. Can't learn an old dog new tricks, as the saying is. But my goodness, he never plays them alike, two days, and how is a body to know what's coming?'"

The quote "Can't learn an old dog new tricks" is an idiom in English language and it means