i can even tell chinese from different countries: s'porean
chinese, m'sian chinese, indonesian chinese, hk chinese, taiwan
chinese and mainland china chinese.
first, their appearance, especially their dressing.
if still cant tell, hear them speak. sure can tell from their
accent.
my telling is only 90% accurate.
the most challenging is mainland china chinese. hear them speak
their own accent, and tell which province they come from.