Used as a polite farewell to a visitor, inviting a return visit.
A polite formula used when one has not heard or understood what has been said, or to indicate surprise.
Don't let it bother you; put it out of your mind.
I don't want to continue with this conversation (usually used in frustration or anger).
It doesn't matter.
A conventional reply to an expression of gratitude.
Absolutely not; I forbid it or it is impossible.