TV series example of the word

Breaking Bad Season 2, Episode 3
we can't be certain it won't recur.

Game of Thrones Season 7, Episode 7
Are you certain?

Game of Thrones Season 7, Episode 3
Uh... I'm not entirely certain.

Game of Thrones Season 4, Episode 3
She is the only one I'm certain had nothing to do with this murder.

Game of Thrones Season 5, Episode 1
Religion has its place, of course, but at a certain point...