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
【參考譯文】
親愛(ài)的薩利，
　　謝謝你邀請(qǐng)我星期六晚上參加你的生日聚會(huì)。我真想去，可是我不得不去鄉(xiāng)下看望爺爺奶奶。他們上了年紀(jì)，身體不好。媽媽已經(jīng)答應(yīng)本周六和我去看他們。我們要在那里呆整個(gè)周末。因此我確實(shí)很遺憾，不能參加聚會(huì)。我想你能理解。
　　在此我祝你生日玩得快樂(lè)，薩利，年年有今日，歲歲有今朝。
你的，
欣欣