A great many people find it very hard to provide such proof.

You may also be asked to provide proof of age or photo identification.

For example, we may ask you to provide proof of Federal employment status.

It is their responsibility to provide enough proof to build a case that will stand up in court.

Prospective members are required to provide proof of military service.

They needed to win a couple of games, however, to provide further proof that their rebuilding effort was working.

If he is dead you will provide explicit and complete proof.

Failure to provide proof of payment can result in a fine.

He argues that the author did not provide enough proof for his argument.

The industry's leadership must provide further proof that it is united behind this proposal.