求一篇英语作文，有要求

Tom邀请Jack参加他这周的生日聚会，当JACK的父母到上海去了，下个月才回来，奶奶有生病了，需要有人照顾，而且要为英语考试做准备，因此无法去参加生日聚会，JACK感到十分抱歉，只好写信道歉，假如你是JACK，请用英语写封道歉信

Dear Tom

Thank you for inviting me to your birthday party. I really want to attend your party, but I am sorry to say that i can't go this time. As you know ,my parents had gone to Shanghai, and they wouldn't come back until next mouth. What's worse , my grandmother is sick and needs me to take care of her. And also I have to perpare for the english exam. so i am very sorry. Here i bring my best wishes for you .Happy birthday!

Yours sincerely

Jack

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