书面表达。
明天是Alice的生日，她准备举行一个生日聚会并邀请Kate参加，但Kate不得不待在家里照顾生
病的妈妈。假如你是Kate，请写张便条，让人捎给Alice。
Dear Alice,
Thank you for inviting me to take part in your birthday party. I'd like to come, but my mother is ill. I have
to stay at home to look after/take good care of her. So I can't come. Happy birthday to you!
Yours,
Kate
答案不唯一