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A. 彼は大学生ですよ
B. 彼は大学生なんだよ
What difference that なんだ makes in this sentence?
For A, I understand it well as "He is a college student!"
For B, eventhough i have read much article written about なんだ... I still cannot understand it.
I notice that there are な+んだ or 何だ.
I feel that it was the な のだ, but i still wasn't sure as to how it changes the meaning of sentence.
In this case, なんだ is used for emphasis. For example, you can use it if you are answering someone's question and you are confident in your answer. Let's say for example that someone asked you if so-and-so is a student, and the questioner isn't certain (doubting) that they are a student, you can say はい, せいとなんだ. (Yes, he/she is in fact a student)
