We have to be sure on the front end that it won't happen.

"You can never be 100 percent sure on the outcome, but I think there's a good chance he will return to play."

I'm sure there'd be someone who took issue with something you wrote - not on a personal level but because that's how the internet works.

In fact, I had an examination made to be sure on that point.

However, one can never be too sure on this point.

She was not as sure of herself on the matter.

But she was sure on her way to being one.

Are you really sure the government would not let the disabled end up on the street?

Are you sure it's not on the other side round here?

"I'm sure on Sunday he'll look at this game as a chance to play here and show what he can do."