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Dear Sir/Mr. Prometheus, I was a student at your college, enrolled in Philosophy Department. I am aat your I am aat your college, enrolled in thecourse. My name is , I am . 2、问候收信人(假如他/她是你的朋友) Dear Prometheus, Hello/Hi. How are you? / I hope everything is fine. / How are things going with you? How are you getting on in/getting along with? 3、解释写信的原因 (1)致谢： I deeply appreciate your courtesy and I hope to reciprocate your favor when the opportunity arises. I am greatly indebted to you for you have gone to on my behalf. Thank you for your letter about studying in Canada. I am writing to you to express my heartfelt gratitude. I am writing to tell you how grateful I am for. I would like to thank you most sincerely for. (2)抱怨： I am writing to complain about the poor service at your dining-room. I am writing to express my dissatisfaction with/at I wish to make a complaint about. I am writing to draw your attention to. I am afraid I have got a complaint about. | 
