be confident about/of sth对……充满信心，确信能，对……有把握
指确信某事会以自己想要或期望的方式发生的（be有时可以换为feel）
请看经典例句：
Management is confident about the way business is progressing.
管理层对业务发展的态势充满信心。
The teacher wants the children to feel confident about asking questions when they don't understand.
教师要孩子们遇到不懂的问题就大胆提问。
Despite the recession the company is confident of further expansion.
尽管经济衰退，公司对进一步扩展仍充满信心。
Mr Ryan is confident of success
瑞安先生坚信一定会成功。
The committee is confident of success.
委员会对成功很有把握。
She is confident of victory in Saturday's final.
她对在星期六决赛中取得胜利充满信心。
The French football team is confident of victory.
法国足球队对取胜很有把握。
We are confident of a successful outcome.
我们相信会有圆满的结果。
The team feels confident of winning.
这个队觉得有把握取胜。
Buoyed by their win yesterday the team feel confident of further success.
在昨天胜利的鼓舞下，该队有信心再次获胜。