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Spanish double R does not make the same sound as the single R. The double R sound is made by the tip of your tongue vibrating, or "fluttering" rapidly, on the ridge behind  your front teeth. The tip of your tongue has to be very relaxed, because it's not your tongue's muscles that make the fluttering

motion, but the air passing over the tip of your tongue. Picture someone holding a strip of paper out the window of a moving

car. That gives you the rough idea of what your tongue needs to do.Listen to the double R sound in cerrado, and tierra. If you can already make this sound, congratulations! For many

learners of Spanish, it takes a lot of experimentation and practice.

We make this sound not only when a word is spelled with RR, but also whenever R is the first letter of a word, such as in rojo

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01067 Spanish Lesson - Present Tense - E-I Stem-changing verbs

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http://studyspanish.com/grammar/lessons/stemi
http://studyspanish.com/grammar/test/stemi