good manners;  courtesy;  civility;  proprieties;  etiquette;  savoir-vivre
To respect/observe the proprieties
The rules of propriety require you to say thank you to her
To have a sense of propriety;  To have good manners;  To behave with propriety
To have no manners;  To be lacking in propriety;  To lack breeding
To exchange compliments/courtesies/pleasantries
To pay somebody a courtesy call