邀请信包括宴会、舞会、晚餐、聚会、婚礼等各种邀请信件，形式上大体分为两种:一种为正规的格式 (formal correspondence)，亦称请柬;一种是非正式格式 (informal correspondence), 即一般的邀请信。邀请信是在形式上不如请柬那样正规，但也是很考究。书写时应注意:

　　邀请信一定要将邀请的时间(年、月、日、钟点)、地点、场合写清楚，不能使接信人存在任何疑虑。例如:“I’d like you and Bob to come to Luncheon next Friday.”这句话中所指的是哪个星期五并不明确，所以应加上具体日期, “I’d like you and Bob to come to luncheon next Friday, May the fifth.”

　　1. 邀请朋友共进午餐 Inviting a friend to informal luncheon

　　Dear [Zhang Ying]:

　　Will you come to luncheon on [Friday, May the fifth], at [twelve o’clock]?

…… 此处隐藏1248字 ……

　　Our new factory will be commencing production on [April 10] and we should like to invite [you and your wife] to be present at a celebration to mark the occasion.

　　As you will appreciate this is an important milestone for this organization, and is the result of continued demand for our products, both at home and overseas. We are inviting all those individuals and trust that you will pay us the compliments of accepting.

　　Please confirm that you will be able to attend by advising us of your time —— we can arrange for you to be met. All arrangements for your stay [overnight on April 10] will, of course, be made by us at our expense.

　　Yours faithfully,

　　亲爱的[哈里森先生]:

　　本公司新厂将于[4月10日]开始投产，希望能邀请[贤伉俪]来参加新厂开工典礼。

　　如您所知，新厂的设立是本公司的一个里程碑，而这正是海内外对本公司产品不断需求的结果。我们邀请了所有对本公司的成功贡献一切力量的个人，我们相信，您一定会赏光。

　　如您确能参加，请来函告知您抵达的时间 —— 以便我们为您安排会晤。当然，所有安排您在[10日晚间]夜宿的费用，皆将由公司代您支付。