套句：

致谢内容，交代感谢原因：I am writing to tell you how much I enjoyed the weekend in your village./ / I am writing to express my appreciation for all that you did for me during my visit in Shanghai. / I am writing to tell you how much I appreciate your hospitality. Thank you so much for your assistance/ for the information your gave us.

进一步解释对方的帮助给自己带来的好处，再次致谢， 回馈承诺Please accept my warmest thanks,I hope I have the chance to reciprocate your kindness.

范文：

April 20，2008

Dear Peter,

I’m writing to show my gratitude for your invitation to your birthday party. That was a really wonderful party. I appreciate your considerate arrangement and wonderful performance you had prepared. And it also offered me a chance to meet many old friends. I really enjoyed that night and I do hope you will have a wonderful life.

                                                                                                                                                                  Yours,

                                                                                                                                                                            Amelia

Dear Professor Chen,

It is just three weeks since I consulted you on how to write a research paper and I’d like to assure you that I really appreciate your help.　Your advice has been very valuable, and I have read the books recommended by you with gratifying results. I have finished my research paper, and I owe it to your help. I would like to express my gratitude, along with my best wishes.　

                                                                                                                                                              Respectful yours,

                                                                                                                                                                              Amelia