英文邀请函一般正式的文体前面都不空格，且段落间是要空一行的。格式如下：
Dear sir/madam:
I'm delighted you have accepted our invitation to speak at the Conference in [city] on [date].
As we agreed, you'll be speaking on the topic "" from [time] to [time]. There will be an additional minutes for questions.
Would you please tell me what kind of audio-visual equipment you'll need. If you could let me know your specific requirements by [date], I'll have plenty of time to make sure that the hotel provides you with what you need.
Thank you again for agreeing to speak. I look forward to hearing from you.
Sincerely yours,
[name]
[title]
范文：
Dear [xx]:
Will you come to luncheon on Friday, May the fifth, at [twelve o’clock]? My niece Mary is visiting us and I think you will enjoy meeting her. She is a charming, very pretty girl „ and very good company! John and Jan will be here, and perhaps we can give a dance after luncheon. Do say you’ll come!
Affectionately yours,
xx
亲爱的xx:
您能在5月5日星期五中午12点钟来吃午饭吗?
我侄女玛丽正在我们家中作客，我想您会乐于见到她的。她是个漂亮而聪明的女孩子，同她在一起是很使人高兴的!约翰和简也到这里来，也许在饭后我们能开个舞会，说好，一定得来呀!
你最亲爱的
xx
无限幻想海浪
