Dear Mr.Smith,
I am really sorry to tell you that Mary can not attend school this morning,because she fell from the bike tomorrow,TH e doctoe says she must stay at home for some days.Will you please record the lecture for me to review later?
Thank you for your consideration.
Yours faithfully,
XXXX
如果不明白,请再问;如果对你有所帮助,
祝开心~!