2.邀请信一般分为正式和非正式两种。熟悉的朋友之间可采用非正式的形式，即正文用第一人称写，称呼也可以随便一些。写邀请信时要做到语言朴实，态度热情，要说明邀请的原因、活动地点和时间。用词要清晰明了;信函内容应简短，不要使用太多描绘性语言。如果要求被邀请者答复，则要在信上注明“RSVP” (“请答复” )或“Please reply”。被邀请人在收到信后应立即答复。
如果接受，应先表示感谢和被邀请的喜悦心情，而且需要重复写明出席的时间和地点。如果谢绝，除了表示谢意之外，还需要表达失望或遗憾之感，然后具体说明不能履约的原因。邀请信及其回复的常用句型：
①We would like to invite you to...
②How about coming...
③I’d be very pleased ( happy, delighted ) to accept ( come to ) ...
④Thank you for your...
⑤Thank you for your invitation. ...but unfortunately...
⑥I am sorry but I simply can’t come...
[例1]邀请信
March 12, 2004
Dear Wang Hong,
We are planning a party to celebrate Professor Zhangs fiftieth anniversary of this teaching career and of course we want you to come. It is next Saturday, March 23rd, at eight oclock in the university dinner hall.
I do hope you can make it. I am looking forward to seeing you.
Affectionately yours,
Gao Ming
[例2]应邀
Dear Gao Ming,
I will be delighted to take part in the party on Saturday, the 23rd of March at eight o’ clock. How nice of you to ask me!
I am also looking forward to seeing you and Professor Zhang.
Very sincerely yours,
Wang Hong
[例3]谢绝信
Dear Gao Ming,
It was sweet of you to ask me to attend the party. But now I must regretfully write that I will be out of the city next Saturday, and I therefore cant accept your kind invitation for the party on that day.
I feel sorry to miss a meeting with you and Professor Zhang.
Best wishes to you and Professor Zhang.
Sincerely yours,
Wang Hong
3.祝贺信是表示庆祝的书信。在西方风俗习惯中，遇到重大的节假日，比如新年、圣诞节、生日等以及亲朋好友之间遇到了什么喜事都应写信致以问候或赠送礼品。贺信的写作要注意主题明确，中心突出，情感真挚但切记不要言过其实，评价要恰当，要表现出真诚的喜悦和祝贺。另外，代表单位的贺信应较为正式，措词要严谨、谦恭。祝贺信常用语：
①Congratulate you on...
②It was great to hear that you...
③With my whole congratulations and best wishes for...
④Luck and success in the coming year!
⑤Please accept our best and sincere wishes for the New Year!
⑥Hearty congratulations and all good wishes on this wonderful day in your life!
[例1]
March 12, 2004
Dear Wang Ying,
We are glad to learn that you are graduating from Beijing University and planning to find a job in a computer company in Beijing.
Congratulations on the job well done while at university and good luck to you during your new career.
I wish you success in all your undertakings and hope youll enjoy your new career.
Anytime you come back home, I wish you would come to my home. Then, we may recall our old happy days. I sincerely hope you will find happiness and success in your new job.
Sincerely yours,
Li Ping
[例2]
March 16, 2004
Dear Li Ping,
Please accept my warm congratulations on your election as president of the Students Union. I can’t think of anyone who would have been a better choice. I feel that it is a fine tribute from your schoolmates, and a reward you richly deserve for your many years of splendid service to the students in your school.
This honor is also due to your ability in dealing with problems, I sincerely hope you will enjoy your work.
Yours truly,
Zhu Ying
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