be confident of 対有信心是一個形容詞短語；have confidence in 有信心是一個名詞短語，兩者詞性不同，應用也不同。
1.be confident of 大意為：對做什麼事情有信心/確信幹什麼事
例句：
I have every reason to be confident of our victory.我有充分的理由堅信勝利勝利是屬於我們的。
As long as that popularity lasts, Mr Kirchner can be confident of outpointing Mr Duhalde. 只要這種聲望持續下去，基什內爾就可以自信地指出杜哈德。
2.be confident in 大意為：對某人有信心例如：Be confident in your judgment and believe in yourself to get things right.我們要對自己的判斷有信心，相信自己能把事情做好。So I would be confident in predicting that this will turn out to be the problem. 所以我可以很自信地預測，這將成為問題所在。
be confident of和be confident in的區別
be confident of 対有信心是一個形容詞短語；have confidence in 有信心是一個名詞短語，兩者詞性不同，應用也不同。
1.be confident of 大意為：對做什麼事情有信心/確信幹什麼事
例句：
I have every reason to be confident of our victory.我有充分的理由堅信勝利勝利是屬於我們的。
As long as that popularity lasts, Mr Kirchner can be confident of outpointing Mr Duhalde. 只要這種聲望持續下去，基什內爾就可以自信地指出杜哈德。
2.be confident in 大意為：對某人有信心例如：Be confident in your judgment and believe in yourself to get things right.我們要對自己的判斷有信心，相信自己能把事情做好。So I would be confident in predicting that this will turn out to be the problem. 所以我可以很自信地預測，這將成為問題所在。