How could he know without talking to someone that knew the boy?

They appeared to know the boy quite well, and asked for his room number.

You know the old boy well enough to bank on that.

She didn't know the other boy, who was very young.

The judge asked how long the minister had known the boy.

I know the boy, and this would not be his style.

But I knew the boy; straight back to his brother, it would have been, and out with the information.

You're not here because you don't know what to do, boy.

Her father demands to know the boy, and she tells him.

You'd never know the resilient boy had just lost both parents and a little sister.