英文感谢信的50字模板可参考以下结构：

一、通用模板

Dear [收信人姓名]，

I am writing to express my sincere gratitude for [具体帮助/支持]。

Your [具体行为] made a significant difference, and I am truly appreciative. Thank you! [你的姓名]

二、示例参考

1. 感谢老师

   Dear Lucy, I am writing to express my sincere thanks for your beautiful flowers. Your guidance and encouragement have been invaluable to me, and I will always treasure the lessons we shared. Thank you, [你的姓名]，for being such an amazing teacher and mentor. Sincerely yours, [你的姓名]

2. 感谢父母

   Dear parents, Thank you for everything. Your unconditional love and support have shaped me into the person I am today. I am grateful for your constant care and encouragement, which have given me the strength to overcome challenges. [你的姓名]

3. 感谢工作机会

   Dear [老板姓名]，I appreciate the opportunity to meet with you yesterday about the position of [职位名称] with [公司名称]。Your team's expertise and the firm's commitment to excellence impressed me, and I believe I possess the qualities required for this role. Thank you for considering my application. [你的姓名]

注意事项

• 保持简洁明了，突出具体感谢事项；

• 可根据场景调整称呼（如老师、父母、雇主等）；

• 结尾使用正式的“Thank you”并署名。