开头： 1、How is it going ？最近怎么样？ 2、I am glad to receive your letter.很高兴收到你的来信。 3、You asked me about(+problem question等）, now let me give you some advice.你在来信 中询问我，现在，让我给你一些建议。 4、It has been a long time since we met.我们很久没见面了。 结尾： 1、I am looking forward to receiving your letter.我期待着你的来信。 2、Thank you inadvance.提前谢谢你。 3、Please wirte to me as soon as possible.请尽快回信。 4、Good luck/Best wishes.祝你好运。 万能句式： 1、I\"d like ...to come to dinner 非常希望...共进晚餐。 2、request the pleasure of 恭请... 3、The favor of a reply is requested 敬赐复函。 4、May I have the honour of your company at dinner? 敬备菲酌，恭请光临 。5、Thank you for inviting us to dinner。谢谢您邀请我们共进晚餐。 英语书信作文： Dear Sir or Madam, I'm Li Hua, a middle school student from China. I read the announcement of the summer camp that you have posted on the Internet and I am interested in it. I know that you welcome students from different countries and I'd like to take part in it. I've been learning English for 10 years, and I speak fluent English. What is more, I'll be able to tell students from other countries about China and learn about their countries as well. I hope I will be accepted as a member of your summer camp. Looking forward to your reply! Yours， Li Hua