But I don't use his name, and that gentleman over there knows it.

Something has happened, but the elder gentleman does not know what.

All of those things are acceptable, and the gentleman knows that.

"It seems to me that all you gentlemen know a great deal more than I do about my own affairs."

I just picked up something you gentlemen should know about.

After all, at the time the gentleman had not known his true identity.

That gentleman knows your name, and you have a right to know his.

At home just as here, a gentleman knows the look of good work, though he cannot do it.

"The start of every art, as you gentlemen know, is control."

It appears, however, that these gentlemen know how to live in peace when they have to.