Professor[Name]/Dear Dr.[Name]，
（I hope this email finds you well.）
My name is[..].I took your[Course name]course last semester.
（郵件開頭的常用客套話）
You may remember me [e.g.coming to your office hours after every test to go over some of my wrong answers/discuss essay prompts/etc.]
（簡要介紹自己及與教授的聯繫）
You may not remember me [e.g.because I tend to put my nose to the grindstone and study on my own.]
如果和教授在課下有過一定接觸，可以寫進來。）
[Course name]was a very challenging subject for me and I was proud of the[Grade]I received in your class.
（寫出自己本課的成績一般會選擇成績較好的課的任課老師寫推薦信）
I am currently in the process of applying to[University/College/School [name] and I am trying to gather a few letters of recommendation.
Because I enjoyed[e.g.your class and teaching style so much/your research/etc.]，I decided to start by asking you.Would you be able to write me a strong letter of recommendation for my[University/College/Schoo]application？
（另起一段，寫明來意：準備申請某學校，因此需要邀請信。）
I would be more than happy to meet with you at your convenience. Of course I would also provide my personal statement，CV，and any other material that you would like.
（另起一段，陳述把自己現有的資料（除了PS、CV外，還可以提供自己做過的research/project/paper的資料）提供給導師，保證對方有內容可寫而不是僅憑上課對你的記憶。有時也有自己先寫好推薦信、讓教授過目修改的操作，需和教授討論）
If you don't feel comfortable writing me a strong letter of recommendation，please don'tfeel obligated to say yes.I completely understand.
I realize that writing a letter of recommendation would be a burden on your time and it means a lot to me that you would take the time to read and consider my request.
（給對方選擇權的同時，保持禮貌順便哭慘）
Sincerely，
[Your Full Name]
（可以加上自己的聯繫電話、Student Number等有關信息）