“Will you be so kind as to pass the bread?”
Yes, and if you are asked if you would like the bread, what should you say?
“If you please.”
“And ‘Thank you,’ if you take it.”
If you should not wish it?
“No, I thank you.”
“Or, ‘Not any, I thank you,’”
How do you know these expressions are polite?
“Polite people use them.”