Finally, after so many years in the states, I could tell the difference of “th” and “s”. Actually, when I paid attention, I would notice people said “sank you” when they should say “thank you”. However, over the years, I was never annoyed by the mistake… But this time was different. I was quite annoyed… I caught the mistake everytime people said so. and it irritated me… “sank you” has a total different meaning as “thank you”, maybe even the opposite meaning…
After I became more sensative to the words, I listened around… you couldn’t imagine how many people spoke wrong, mostly Chinese…
And now I understand why some people chuckled after I pronounced something wrong… it was hilarious…