R and L
It is difficult for Japanese to pronounce R. Normally just pronounce R as L.
Everybody knows that there is no retroflex (eg, R sound) in Japanese. Somebody wants to say that is some physiological deficiency of Japanese. I do not agree on that. If you could not pronounce Arabic ( language ), do you think you have some physiological deficiency?
For me, learning a foreign language is just some mouth practice. If you get the point and practise enough, everybody can do that.
I believe most of us can whistle, remember, at such time, your mouth and your tongue are ready to pronounce R very well.
You can have a try now. Soon you will find the difference between R and L.
