The two men had known each other for a long time.

I don't think the old man knew what his son was up to.

We don't know the many things the white man knows.

These four young men didn't know each other, but they did have something in common.

But don't you think men and women should know themselves better?

Most young men I know live to hear themselves talk.

What did a man know about a woman who was with child?

The two men have known each other for 20 years.

The men had known each other for at least 30 years.

Where he would return and when, only one man knew.