My good english teacher

I have a good singaporean friend .His name is Shon .
Actually He is not english teacher . He is a lawyer.Well he often invite me his home and teach me english .That's why I want to call him a teacher .He is very good at teaching english .It's easy to understand .
Yeasterday we talked about "Keigo" .
Mr Shon said "Keigo has a built in system of allowing people to show respect to others.
It helps one not to offend other people ."
I really agree with his opinion . What do you think?
Next time I'll put his phot on this.