Tom 邀請Li Ping 參加他這周日的生日宴會，但Li Ping的父母出差要到下個月回來，奶奶又臥病在床，需要人照顧。再說英語考試即將來臨，因此，無法前去參加生日宴會。Li Ping感到很抱歉，只好寫信辭謝。
Thank you very much for inviting me to your birthday party. I'd love to go but I can't.
From Li Ping
Thank you very much for inviting me to your birthday party. I'd love to go but I can't. My parents are out on business. They are coming back next month. And now I have to look after my grandma because she is ill in bed. And I also need to study for my coming English exam. I'm very sorry but I can't go to your party. Thank you for asking me. I hope you can have a good time.