感谢信，是向对方表达谢意的书信。感谢对方的关心、支持、帮助或热情款待等。主要内容是说明感谢的事由并表示真诚的谢意。其写作步骤建议采取“三步走”战略，具体如下：
★【写作“三步走”】：
表示感谢—>说明事由—>再次表示真诚感谢
感谢信在写作中需要注意的是：表达的感激之情要恰到好处，不要草率，也不要过于夸张。言辞应真挚、得体。建议在结尾尽量表达希望回报对方的愿望，显得更加真诚。
★【模板句型】：
第一步：表示感谢
thank you so much for …
i warmly appreciate your hospitality.
i am writing to express my thanks for …
i am writing to extend my sincere gratitude/appreciation for …
i would like to convey in this letter my heartfelt thanks to you for …
第二步：说明事由
thank you very much for the gift you sent me. it’s one of the most wonderful gifts i got on my birthday.
i am writing this letter to thank you for your warm hospitality accorded to me and my delegation during our recent visit to your beautiful country. i would also like to thank you for your interesting discussion with me which i have found very informative and useful.
第三步：再次表示感谢
thanks again.
again, i would like to express my warm thanks to you! please accept my gratitude.
thanks again and i hope that i will have the opportunity to return/ repay your kindness.
i am looking forward to…