一、功能文

I am writing to express my sincere gratitude for.I am writing to express my thanks for.I truly appreciate your.it is very kind of YY You for taking your time and trouble to do sth . my life as an exchange student could not have been so wonderful without You . without YouI would not.please accept my sincere appreciation for.I would like to take this opportunity to express my great appreaciation for your Ort and assistance . I am writing to express my thanks for your friendly2、案例：

你参加美国交流项目回来后，住宿家庭发来照片，请写一封回信。内容如下：

1、表示感谢

2、说说你最喜欢的照片。

3、邀请他们来中国

Dear Mr. Smith

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欢迎写完作文的同学们关注9314次英语，并将作文发给我私信。我们一起讨论吧。