考研英语感谢信的写作通常遵循以下结构：
开头
使用礼貌的问候语，如 "Dear [姓名]"。
表达感谢
使用 "I am writing to express my sincere gratitude" 或 "I would like to convey my heartfelt thanks to you" 等表达。
说明事由
详细说明你感谢对方的具体原因，如提供的帮助、给予的支持或热情款待等。
再次感谢
表达对对方帮助的再次感谢，并可能表达回报的愿望。
结束语
使用 "Yours sincerely," 或 "Best regards," 等礼貌的结束语。
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示例一：
```
Dear [姓名],
I am writing to express my sincere gratitude for your kind assistance during my recent visit to [城市名]。
Your guidance was invaluable to me, especially when navigating the unfamiliar streets and shops of this bustling city. Without your help, I would have been lost and possibly overwhelmed.
I am especially thankful for your timely return of my admission ticket, which allowed me to attend my law exam on time. Your prompt action saved me from a great deal of trouble and inconvenience.
I look forward to seeing you again soon and sharing more stories from my adventures here.
Thank you once again, and please accept my warmest regards.
Yours sincerely,
[你的姓名]
```
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示例二：
```
Dear [姓名],
I am writing to convey my heartfelt thanks for your warm hospitality and support during my stay in [国家名]。
Your kind words and thoughtful actions meant more to me than you will ever know. Your interesting discussions and generous gift were the highlight of my visit.
I am grateful for the opportunity to have experienced your culture and to have made a new friend. I hope to have the chance to reciprocate your kindness in the near future.
Thank you again, and I wish you all the best.
Yours sincerely,
[你的姓名]
```
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请根据具体情况调整信件内容，确保表达出你的真诚感激之情。