But there is one thing you can be perfectly sure of.

Yes, I am perfectly sure he will vote right now.

"Perfectly sure, but you and I will take a look around the shop."

It is extremely far away and moving very fast, so we can't be perfectly sure.

I'm perfectly sure that these pearls were all right yesterday.

He went to the house and entered by way of the kitchen, feeling perfectly sure all the while that Pop was watching him.

He was not perfectly sure which truth frightened him more.

Delacourt was not perfectly sure what he ought to do with her.

Not perfectly sure, but it definitely hasn't changed very much.

He had been perfectly sure that the experiment would fail.