英文作文：写一封信给您的一名是英语教师的朋友请他帮忙教你的妹妹（不少于100字）谢谢!

From your friend _______
1st January,2011
Dear Tom：
I have not seen you for years.It is my great honour to write to you once again.My dear friends,you know we have been friends for long time and you would always try to to help me,whenever I need your help.Currently,my little sister is in great need of a English teacher and she just comes to me for advice.As I guess you are the best English teacher I have ever seen,therefore I write this mail to you.Sincerely,I hope that you can teach her.I could promise you that she is a kindness girl and you would never waste your time to
do that.Certainly,my sister will pay for your courses if possible.I am looking forward your reply.
Sincerely yours