Dear Sally,
Thank you very much for asking me to your birthday party on Saturday evening. I'd love to come, but I have to go to the countryside to see my grandparents. They are very old and not in good health. My mother has already promised to visit them with me this Saturday. And we'll stay there the whole weekends. so I'm really sorry I can't come. I think you can understand.
Here I wish you a lot of fun on your birthday, Sally, and many happy returns of the day!
Yours,
Qi Qi
【参考译文】
亲爱的萨利，
谢谢你邀请我星期六晚上参加你的生日聚会。我真想去，可是我不得不去乡下看望爷爷奶奶。他们上了年纪，身体不好。妈妈已经答应本周六和我去看他们。我们要在那里呆整个周末。因此我确实很遗憾，不能参加聚会。我想你能理解。
在此我祝你生日玩得快乐，萨利，年年有今日，岁岁有今朝。
你的，
欣欣