问题描述：
请大家看看这篇英语作文有什么语法问题,如果有,怎么改?
Dear Tom
Thanks for asking me to come in your birthday party.But my parents aren't in home now,they will back next month.And my grandmother is ill in bad.She needs somebody to look after her.So I have to stay at home and look after her.By the way,the English test is come.So I must study for the English test.
I'm sorry for that.Maybe next time,I will come in your party!
Yours
Li Ping(不是真名）
Dear Tom
Thanks for asking me to come in your birthday party.But my parents aren't in home now,they will back next month.And my grandmother is ill in bad.She needs somebody to look after her.So I have to stay at home and look after her.By the way,the English test is come.So I must study for the English test.
I'm sorry for that.Maybe next time,I will come in your party!
Yours
Li Ping(不是真名）
问题解答：
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