初二英语作文：假如你是Mary，你的朋友Lisa邀请你参加她在星期六举办的生日聚会，但你周六要参加乒乓球训

Lisa
Thanks for your invitation,I'm sorry,I can't come to your birthday party. I'm very busy this Saturday.Game of table tennis will be held immediately,I have to participate in table tennis training.I hope you will understand
Love you
Mary