Sentence examples for been sure about from inspiring English sources
Scientists had not been sure about why particles have mass.
But this assumes that Comey, or anyone, could have been sure about how the investigation would have turned out, and how long it would take.
Officials in District 3 said they had not been sure about what might happen to the remaining supplies in the Office of Family Engagement, so they decided to give them to parents.
By Wolcott Gibbs The New Yorker, April 22, 1939 P. 11 If he did nothing else, Willard Huntington Wright proved that extreme culture can serve a useful purpose, something we had never been sure about until he came along with Philo Vance.
But I have never been sure about the "Madiba magic" you displayed on that day.
I am quite the conspiracy theorist, but I've never been sure about the rumors/theories regarding Lennon's death.
The only reality you can be sure about is in your own perceptions.
One cannot be sure about Brecht.
But this we can be sure about.
