Additional examples are adjusted to the entries in an automated way - we cannot guarantee that they are correct.
We'll start with two things we do know for a fact.
I know for a fact two of the kids aren't his!
I could tell he did not know that for a fact.
He knows for a fact that I want him to leave.
If there is one thing I know for a fact.
And I know for a fact that will mean something to those guys.
You could go both ways; they knew that for a fact.
"Do you know for a fact he was with her that night?"
What do I actually know for a fact, here, really?
For a fact, I never saw her the whole time we were there.
I know for a fact that you are not, and never have been, one of us.
I know for a fact you are working to control the size of the field.
Which he knows for a fact she does not spend on the child.
I know this for a fact because I've seen him on tv.
These are things that most of us know for a fact and don't question.
Perhaps that is so, but do we know it for a fact?
Because we know for a fact certain that arms have gone in there.
We know for a fact that things are made with too many parts.
I know this for a fact because my father stopped at every one of them.
So we know for a fact that he died between eight and ten.
He knew for a fact that he'd been named in one will.
He knew this for a fact because she had come to the hospital.
"I know for a fact you can do a better job than that."
They know for a fact that the new drugs will make everything all right.
They can't run with us, I know that for a fact.