But of course one case doesn't prove anything; we'd like more.

But those cases do not necessarily prove that radiation was the cause.

But the case could prove to be a burden for his campaign.

But four cases proved serious, according to the department's figures.

The case could prove to be a big political scandal.

Chance determines so much of our lives, as my case proves.

But the cases have proven to be more complex than expected, in part because of new evidence turned up at each step.

"But perhaps this case proves the exception to your rule."

Other cases have proved more difficult, but it's been instructive.

I mean that we cannot, in any case, actually prove what became of him.