Is there a mnemonic for the ten commandments of good manners? ?

Yes, there is a mnemonic for the ten commandments of good manners. The mnemonic is "MAGIC WORDS":

M - Mind your Ps and Qs
A - Always say please and thank you
G - Greet others with a smile and hello
I - Introduce yourself and others
C - Cover your mouth when you cough or sneeze
W - Wait your turn and be patient
O - Offer help when someone needs it
R - Respect others' personal space and belongings
D - Do not interrupt or talk over others
S - Say excuse me when you need to leave or pass by

Remembering the word "MAGIC WORDS" can help you recall the ten commandments of good manners.