The cause of the fire is not known with certainty.

And she knew with certainty they were holding hands under the table.

Nothing is known with certainty as to the date or author.

I still didn't know with certainty what that something was.

Looking at things other than those I know with certainty will be of interest.

The one thing we know with certainty is that they will remember us.

There is no way to know with absolutely certainty if the plan I have in mind will work.

The date of his death is not known with certainty.

He knew with certainty that his days were fast running out.

So now they knew with near certainty where it had been born.