It can't be proved.
It can not be proved to be true.
It can be proved with just a few hours of work.
a boy jumps over the wall
The artist refused to use himself as a subject for his paintings.
The people are sitting in their homes.
The other man grabbed the sword and stabbed him twice.
The pumps looked merry go rounds, moving in circles.
The sword flew through the air and landed in the Kal's body.