e.g.
You must be confident in what you do. 妳必須對所做的事有信心
We are confident about the future. 我們對未來充滿信心。
I’m fully confident of winning the title. 我對贏取冠軍信心十足。
This time they’re confident of a happy ending. 這壹次,他們確信會有壹個快樂的結局。
I am not very confident about tonight's game.我對今晚的比賽不是很有把握。