Friend, not student. She's in her 40's or 50's, native Japanese speaker.Elizabeth said:I asked about this difference a while back and the reply would have been in this case your student is slightly atama ga okashii.
Your episode reminds me of my childhood.JimmySeal said:I was talking to some friends a while ago. One had got a new game for her Nintendo DS that teaches English. I wanted to know why she had decided to start working on her English so I said "Nande Eigo wo benkyou shitemasuka" to which she replied "Kono ge-mu wo tsukatte." Feeling nonplussed, I asked "Doushite eigo wo benkyou shitemasuka" and got the same response, a little more insistent the second time. Finally I got around to using naze and the whole issue was resolved.