我真的不明白英文

有几种说法：1 I beg your pardon?2 I don't get it3 I don't understand what you said.第1和2比较客气，外国人常这样讲，第3不太客气，比较生硬。

I realy don't know he completed his college

一级：Sorry， I don't understand what are saying.二级：Sorry，I don't really get your point.祝学习进步

I really don't understand how you can make a mistake like this.

有很多不同的说法如果是 我不明白你说什么 想要让他再说一遍 解释清楚的话I didn't quite understand you. 如果是 在吵架 比方说捉奸之类的 表示我没有干过 不明白你说什么 I don't know what you are talking about. 还有很多 根据不同的语境 有很多不同的说法

I don't get how you made such a mistake.

1、我不明白你的意思：I dont understand what you are saying。 2、我不明白你的意思朋友真的。I dont understand you, mate, honest. 3、对不起，我还不太明白你的意思。Im afraid I dont quite follow your gist. 4、我一点儿也不明白你的意思。I have no idea ( as to) what you mean.