你的朋友邀请你参加他/她的生日聚会，告诉对方你不能接受他/她的邀请。你应包括下列内容： 1.告诉对方你不能接受他/她的邀请； 2.对对方的邀请表示感谢； 3.说明无法接受邀请的原因。
Dear Lisa:
Congratulations on your coming birthday. Thanks for your invitation, but I am sorry that I am afraid I am not able to attend your birthday party. You know, our company will hold an important meeting in our Paris branch to talk about the recent trouble appearing in business. I am the one who needs to make a presentation. I am terribly sorry for that. Anyway, I hope everything goes well in your birthday party. Remember to show me the pictures taken in the party when I come back from business trip.
Best regar
Yours Susan
