Buntaro said:
Damicci has the idea. Practice saying vrrrrrrrrrrrrrroom!
(Buntaro takes his favorite toy car and runs all around the house with it....)
Heehee...this brings back some memories of childhood.
I used to play the Shibboleth game in which I'd give a mutlple-trilled rrrrrrr and ask my friends to immitate.
Hey, it's a human sound, so you should be able to do it, too.
To his frustration, it could not be imitated....heehee!
I think Buntaro and Damichi's trill excercises are good ways to get the tongue muscles acquainted to the position. One additional trick at the medial postition is to remove the tension towards the end of the tongue which is quite important for producing the desired trill. After a little practice with the machine gun trill, try the fine tuned trills by doing the single-shot, double-shot, triple-shot,...(actually in the reverse order from long to short)
Then try RRRRRRRRRA-DI-O, RRA-DI-O, and finally RA-DI-O.
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If you are familiar with the single-flap sound in American English, I think that also helps as a sound very close to the Japanese R.
The only difference is that the Ameringlish flap sound always comes in the intervocallic postition, that is either between two vowels or a vowel and a syllabic l (an l acting as a vowel; and sometimes a syllabic n; and others), whereas the Japanese R comes as the initial consonant in a syllable.
1. flaps between vowels; -d- -dd- -t- -tt- (second vowel is unstressed)
eg. radio, body, buddy, shooter, butter, bidder, bitter
2. flaps after a vowel, before an l:
eg. ladle, puddle, subtle, bottle
3. flaps in other intervocallic positions:
eg. birdie, curdle, hurdle, murder, mirtle, forbidden
Enjoy practicing. TRRRRRRRRRRRRRRRRRRRRRRRRRRRRR......... ^__^