感谢信常用句
1. thank you for your help in locating the newspaper article i was searching for yesterday.
2. thanks to your efforts we had our most successful outdoor activity ever.
3. i want to compliment your organization on its speedy handling of my order.
4. we would like to thank you for your service as a volunteer.
5. we would be honored to have you as a guest speaker again in the future should your schedule permit.
6. we sincerely appreciate your humanitarian efforts.
7. we are fortunate to have you with us.

祝贺信常用句
1. i am so pleased/glad/delighted/thrilled to hear that…
2. please add my warmest congratulations to 。。
3. it was a great pleasure to hear the good news that …
4. congratulations on your recent promotion.
5. please accept my congratulations on。.

best wishes for the future
(a) i wish you every success.
(b) all the very best for the future.
(c) i rejoice in your good future.
(d) may your future be as successful as you have always been.

道歉信常用句
1. i am sorry that i couldn’t attend your party because…
2. i wish i didn’t give you too much trouble.
3. i regret that my carelessness has caused you too much inconvenience.
4. much to my regret that…
5. i must apologize here…
6. i am writing to ask you for forgivingness.
7. let me apologize here that…