Very good teacher overall.

Other reviews of Luis 帶你一步一步學好西語

LL, R , RR , B, V ....etc. really make me confused. Fortunately, Luis seems that he know everything including "how many pronunciations in different country or different area". Even better , he does show his real-time imagine on monitor. It makes me much easier to understand how the mouth , tongue and throat work for that sound.