Buck knew well that things would get worse before they ever got better.

Buck didn't know what to do in the face of the dead and dying at a time like this.

Buck did not know how long he lay on the floor.

Rayford told her he had and asked if she was sure Buck didn't know.

Buck knew the address and the general area, but he had not been there before.

I'm sure Buck knows the way if we can't figure it out.

Buck wanted to say something but knew he couldn't communicate at this level.

Buck knew somebody already had to have the old man.

Buck didn't know the man but he wouldn't likely have personally known anyone they might stay with.

As soon as he came into the house, Buck knew something was wrong.