how ro know which email did you used on duolingo?
maybe it's a bit strange but my sister is using duolingo as well.each time she forgets her password she creates another account :D but now she realized she can restore her password but she don't remember which email she used on her specific duolingo account.is there any way to know that? o.O
Yes, you can always restore your password. She should check for any emails from Duolingo in her email accounts to see what previous emails she used.