学生:
Excuse me, Mr.Li, I have a question want to ask you. 

李老师,您好,我有个问题想请教您。
李老师:
What question? 

什么问题?
学生:
It is a math question,I have my doubts about it. 

是关于这道数学题的,我对此有疑问。
李老师:
Ok, go ahead. 

请说。
学生:
It is complicated for the second step. May I use this way? 

您看这第二步,这样做是不是太复杂了,我可不可以这样做?
李老师:
Let me see. 

我来看看。
学生:
I think it is easier with this method, but I don't know if it is right. 

我觉得我的方法比较简单。但不知道正不正确.
李老师:
Very good, you have an active mind. 

恩。不错,不错,思维很活跃。
学生:
I am keen on the math. 

我对数学方面很感兴趣。
李老师:
Well, keep punching. 

好,继续努力。