英语作文母亲生病了我没能参加好友的生日聚会道上周一好友XXX邀请我去参加她的生日聚会,但那天我母亲生病了,需要我在家照顾,所以就没能去参加生日聚会,现在想写一篇道歉信跟她说明情况.要英语的,求各位大侠帮下忙!

Dear XXX, I am writing to say that I am extremely sorry that I could not attend your birthday party last Monday. Because my mother was seriously ill with fever, I had to send her to hospital a...