And you can't prove a thing to be what it isn't.

You can't!" "Are you sure ?" "Certain sure," he replied with emphasis.
"Do you know that I shall have to give evidence before the court ?" she announced resentfully.
It was an announcement that gave him pause.

Thoughtfully he stroked his abominable tuft of red beard.

Then he dismissed the matter with a shrug and a smile.
"Well, and what of it ?" he cried.

"They are not likely to bully you or cross-examine you.