I teach high school Spanish in Oklahoma, USA. Does anyone know of a way to teach HOW to roll your tongue to make the double r sound, like in aburrido or perro? I've got some students who can't do it naturally. I've asked a speech-pathology friend of mine and she didn't know. It's not a sound in the English language per se, so I don't know what to do. I can do it myself but have no clue how to help my students.