A. Manners

Courtesy is still important nowadays. [politeness and respect]
The teacher said her students were always very courteous. [polite and respectful]
She addressed the customer in a very discourteous manner. [impolite and lacking respect]
I hope I didn’t appear offhand with her – it’s just that I was in such a hurry. [showing a rude lack of interest in others]
The boy had an insolent expression on his face which irritated me. [rude and not showing respect]
What’s the etiquette at a traditional Chinese wedding? Do you know? [accepted rules or customs]
Here, have a seat. Relax – there’s no need to stand on ceremony. [behave in a formal way]
My elderly uncle and aunt are both rather straitlaced. [having old-fashioned and strict morals]
Asking for more food at a formal dinner party is just not the done thing. [what you are expected to do in a social situation]
When taking part in online discussions, always follow netiquette and keep your comments brief. [code of behaviour online]

B. Body language and non-verbal language