As to the rest, I had never once heard of them.

I never once heard these men say those words, all the time we were away.

Yet all that time I have never once heard of the man you name.

I have more than once heard her speak of them.

He had once heard another old man say that who was going to lose his son.

At least that's what I heard in a movie once.

I once heard that a space, to be considered a room, must have a window.

I once heard him claim he'd been shot at several times.

I have never once heard a staff member say that wouldn't stay after the school day for some activity or other.

I once heard somebody on B5 say that nobody is what they seem.