be confident in
对某人有信心
例如:I am confident in myself.我对自己有信心!
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。
be confident of doing. 自己对做事,某事有信心,一般加动词+ing
I have every reason to be confident of our victory.
我有充分的理由坚信胜利是属于我们的.
I agree with you, save that you should be confident of success .
我同意你的意见,只是你应该有信心成功。