I really don’t know what the big deal is. I can take a group of 30 kids with wacked out phonics pronunciation and have them OK within thirty minutes (assuming they have the basics.)
If Chinese teachers say it wrong, fix it. My co-teacher did the same thing when I started (-uhs and -ahs), now her pronunciation is much better.
And I’ll never let anyone ever slip with pronunciation. When I catch it, it gets corrected.
I don’t know all the tricks, but it helps to know how the tongue and mouth should be positioned when making the different sounds. Show them how to properly recreate sounds they mess up. An easy one to fix that comes to mind is the “th” sound like in mouth. Kids are always messing that one up.
I have a feeling people just don’t take the time to correct these problems. I know I didn’t use to. I would just stop at “good enough.” Now I demand perfection from everyone when it comes to pronunciation and enunciation. The only ones I let slide a little bit are the ones that are also having difficulty pronouncing things properly in Chinese. Then I figure something else is going on.
I also take the time to know the correct pronunciation of the words I teach. While going over “different” in class today I noticed that I said it two ways, once with 3 syllables and once with 2. I took the time to check a dictionary and find out that both are correct, though I’ll stick to using one variation.
I also found out some time ago that some people say palm with a silent L. I don’t, and no one is incorrect (though it’s good to know these things.)
And these problems do come from something Taiwanese. Me niece is 2 or 3 now and was saying “effoo” last weekend (as taught by her 奶奶.) When I corrected her in the past she wasn’t able to make the proper F sound, but she did last weekend after one try.
It’s not really all that serious. I just like looking up words in dictionaries and don’t get to share my excitement about it much with others .