英文感谢信的格式及范文如下：
英文感谢信的格式：称呼：可以称呼对方为“Dear”（尊敬的），或者“Mr./Ms./Mrs./Dr.”等等，这些称呼都需要根据对方的身份和关系来判断；正文：需要对对方进行感谢和赞扬，表达自己的喜悦之情，并体现出诚挚的感激之情。结尾：需要简洁，表示再对对方的帮助表示感谢并表达诚挚的谢意。结尾可以使用“Sincerely”或“Best regards”等等礼貌的语言。
英文感谢信的范文：
Dear Mr. Smith,
I am writing to express my sincerest thanks for the favor that you did for me. You have helped me a lot in my recent work, and I really appreciate your kind and professional assistance.
Without your help, I would not have been able to finish my work in time, and I was really worried about the deadline. You gave me a lot of useful advice and guidance, and your patience and dedication made a huge difference. I have learned a lot from you, and I will always remember your kindness and generosity.
Once again, thank you very much for what you have done for me. If there is anything that I can do for you, please do not hesitate to let me know. I look forward to the opportunity of working with you again soon.
Sincerely,
Jack
感谢信与表扬信的区别
1、写作意图不同：感谢信的写作意图是表达感谢之情，感谢对方的帮助或支持，表扬信则是用以向对方赞扬和感谢过去所做的正确和重要的事情，强调其贡献的重要性，以达到肯定和鼓励的效果。
2、表达方式不同：感谢信的语气比较客观、诚恳、简洁，表扬信则相对强烈明显，语气应该比较肯定、充满感情。
3、对象不同：感谢信和表扬信写作的对象不同。感谢信一般是针对个人的，写给对方或者对方的组织，表扬信则更倾向于对针对整个团队或者组织。
4、结尾不同：感谢信通常在结尾处表达自己对对方的感激之情，而表扬信则通常在结尾处重申对方的贡献和价值。