Second, economic theory predicts that some incentives matter more than others, and the data confirm the  Executions prevent murders, but convictions prevent even more murders.
Executed murderers will never murder again.
Getting murderers off the streets has no effect on reducing murders.
There are five people watching a movie outside.
The man is putting something in his mouth.
That sounds dumb.
the guitarist is asleep
Several people are talking with football players in a room
Form and substance are two completely separate, unrelated entities.