>Why do Japanese people pronounce "ra ri ru re ro" sometimes with "r" (not an English one, it´s more of a Spanish r) and soft "l"? You are right, Our pronounciation is mixed when we say "らりるれろ". I think our way of pronouncing R is "slightly hitting the hard palate by tongue", which is similar to Spanish R, and not similar with English/French/German R where the tongue does not touch the palate. And yes, we sometimes use 'L' sound instead of 'our R' sound. However there is no problem to us and we don't wonder like you do. It is because we don't have hearing distinction between R and L, which means if you pronounce L, we hear it as 'our R'. I think when we say 'らりるれろ' slowly, we pronouce 'RA RI LU RE RO', but saying it rapidly, it is gona be 'RARILULERO', because it is harder for you to hit the palate by tongue when you say 'るれ（RURE)' so fast. Then you wonder why R change to L, but we don't wonder, because it is all same sound to us whether you say L or R. It ends up with 'our R' >Which one should I use? I also believe 'Spanish R' is very similar to 'our R'. It is a good idea to always use it.

It might not the answer that you want, but we don't have "R" sounds in Japanese. So, when you pronounce "ra, ri, ru, re, ro", those sound should be "L" sound, such as "la.li.lu.le.lo".