6) The extent of lower costs for higher-volume mailers is unknown.
It is not know what extent of lower costs is for high-volume mailers.
The high-volume mailers have a known extent of the lower costs.
Sergeant Rennie was silent.
I said I had laryngitis.
The man is using the ladder to defend himself against attackers.
Socialism makes people think of the Mexicans.
The cook is giving a formal speech at a sanitarium.
A group of people are playing.