主题：写信给你的导师，告诉他你不能继续晚上的业余课程。
You have a full-time job and are also doing a part-time evening course. You now find that you cannot continue the course. Write a letter to the course tutor. In your letter
Describe the situation
Explain why you cannot continue at this time
Say what action you would like to take
范文：
Dear Mr. Smith,
I am writing to inform you that I will be unable to continue with the part-time computer programing course.
I have been attending your evening classes for the last two months, and have enjoyed them immensely. As I stated on my course application form, I work full-time for a large IT company, and until now I have managed to fit the programing course into my schedule.
However, my company is currently on the verge of signing a contract with an important new client in China, and I am part of the team that is being sent to Beijing to negotiate terms and conditions. I will probably be out of the country for several weeks.
I am aware that you run the same course twice a year. Rather than try to catch up when I return from China, I was wondering if it would be possible for me to join the next cohort in September.
I look forward to receiving your response.
Yours sincerely,
Paul Jones