Despite the lack of evidence, he remained cock-sure that his theory would be proven correct.

She spent the afternoon making sure all the lights were turned off before leaving.

She always makes sure the windows are locked before leaving.

She made sure to lock the back door before leaving for work.

I checked the report twice, and sure enough, there was a minor error in the figures.

We shouldn't rely on sure things when planning for the future; unexpected events always occur.

We need to sure up the foundation before the storm hits.

He's going to be late, sure as eggs.

The sure-footedness of the mountain goats allowed them to traverse the narrow ledges without hesitation.

Her sure-fire strategy for calming the crowd involved a simple, sincere apology.