帮忙写篇英语作文-----急急急急急急急急急急

Dear Tom
Since we met last year, we have not get together for a long time. It is quite a nice surprise to receive your invitation for your birthday party this weekend. However, my parents are going overseas on officical bussiness for a month, and I need to stay at home to look after my grandmother because she is not feeling well. Besides, my English examination is coming soon. I need more time to prepare for this important examination. I hope you can understand my situation and why I can'祥敬t attend your party. I promise to find time after the examination to visit you.

Thank you and wish you happy birthday!

Li Ping

(写得匆忙，请首宴扮者灶自己删减和检查spelling！）

Dear Tom,
Thank you for inviting me to your birthday party this Sunday ,but I am afraid I can't go to your party .I am really sorry . My parents has gone to another city on business. They will come back next month.My grandma is ill in bed,I have to take care of my granny at home.And an English test is coming, I have to study for a test on Weekends.
Yours,
LingPing