He has many [few] acquaintances.／He has a large [small] circle of acquaintances.
「a sociable [an unsociable] person／a good [bad] mixer
He is like [as close as] a brother to me.
We are on a first-name basis with each other.
We have been friends known each other for a long time.
I have a nodding [speaking] acquaintance with him.
Are you getting along well with your neighbors?
I am not acquainted with him.
Why did you break off with him?／Why did you stop seeing [associating with] him?
He is not very sociable.／((口)) He doesn't like to hang out with the group.
I went to a bar with him just to be nice.