Ok so here is the example:
Are you a student? - You just want to ask if the person is a student.
You're a student? - You are surprised, because you didn't think he is a student.
Aren't you a student? - You are surprised, because you thought he is a student.
The three sentences mean the same if written on paper? But when they are pronounced, they expected answer is different, right? Is there a rule for pronouncing it? I'm asking because a friend is learning English and I can't explain it to him clearly. He says in his language, there is no difference, on how you pronounce those questions, they are all the same.
I would be glad, if someone can help us.