How to use "proved" in a sentence

That is why our constitutional system has proved itself the most superbly enduring political mechanism the modern world has ever seen.

But he had a very good alibi, which proved his innocence.

When they found a letter in his pocket which proved that he had been sent to spy on them, they tied him to a post inside the inn,

My mom proved it in the laboratory

Now that you've proved whatever you needed to prove, you can relax."

Only bureau chiefs, their immediate staffs, station chiefs in major cities, and senior field officers who had proved themselves and their loyalty - only those people knew the true nature of their employers and their work

She confessed to the murder of her husband and proved easily that she knew how to work the steam hammer

Henri had just proved that Charas seemed to be getting close to some kind of clue in this business with the flies.

Sadly, our dinner only proved Griselda had been right when she'd said that the more she tried, the worse things went

Mr Redding has been proved to be innocent.'

And it proved that Miss Marple had been right in every detail.

'I knew she had done it, so what did it matter if that proved she had killed him?'

After having read them all, Mr Kyrle said that Laura's identity was now proved