Thank you, Cleve. As for No. 1, M is a student and F (I should have written Ms. Sato) is a teacher. Is Ms. Sato too polite to the student? Sato is a lady, and sometimes in Japan female teachers speak very politely to their students. Do you have any idea about my comments?
Hi, I understand that politeness is a very important part of Japanese culture, so I think you are the better judge of how to word a dialogue between Japanese people.