Good manners dictate that you respect the selections of the host.
"Good manners dictate you allow me the pleasure of imparting my news."
For both men, good manners still dictated that one entertain one's guests without unduly disturbing them.
Good manners dictate that you listen to others and they listen to you.
Good manners dictated that she accept him and she graciously murmured her thanks.
Middle Eastern culture and manners dictate that one never offend one's guest.
Custom and good manners dictated that she veil the reasons slightly, but nobody had any doubts on the matter.
Or perhaps you thought good manners would dictate that I never speak of it again.
We have much more curiosity than good manners properly dictate.
"If manners dictate that what you did requires an apology, then I forgive you."