Dear Cindy, Thank you for inviting me to your birthday party next week ,but I'll be really busy. On Monday, I am going to a movie with my parents. On Tuesday I have the piano lesson. And I have to study for a test on Wendesday. On Thursday I am taking care of my granny at home. On F riday, I'll have tennis training. So I am afraid I have no time to your party .I am really sorry. Happy birthday ! Yours, Ann