be confident in 对某人有信心
例如： I am confident in myself. 我对自己有信心！
I am confident in you.我对你有信心！
be confident of 对做什么事情有信心/确信干什么事
He is confident of getting the first place. 他对拿第一有信心/他确信拿第一
He is confident of getting his report finished by the end of this month.
confident about 对于一件事有信心
I am confident about the future of our company
I am confident about the prospect of my career
be confident with 对做什么事情有信心, 对一群个体有信心
I am confident with my students.
I am confident with my staffs / employees.
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