It's not the done thing to grab something off a stranger in the supermarket just so you can check it out, is it?
A percentage tip left on the bar in a pub is not the done thing - although in a bar or club it's fine.
Drain each batch as it is done and eat whilst cooking the next batch.
In populations where drinking cows' milk is not the done thing, lactose intolerance is still the norm.
It is not the done thing to listen to music through headphones.
He has worked in the media for more than twenty years, and he knows, or should know, the way the world is now and what is not the done thing.
I sat down at the table and when the food was done , he pulled it out and sat it in front of me and then sat down.
He's assured me that it's not the done thing to drink at lunchtime these days, but I'm not so sure.
When I was growing up it just was not the done thing for a woman to smoke outdoors.
It is not the done thing in the upper class circles of public schools and gentlemen's clubs to put the boot in so crudely.