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.
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2016-06-02T18:27:32.477
34591
2016-06-08T08:14:56.037
13611
question
grammar
What additional meaning that なんだ add to the 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)
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2016-06-08T05:20:31.997
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2016-06-08T08:14:56.037
2016-06-08T08:14:56.037
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answer