Mar.11st（日期放右上角）
Hi（Dear）Mike,
Thank you for inviting（invitation 是邀请的名词形式，它的动词是invite。thanks for 后需要用动名词，去掉your改成thanks for inviting，另外一种修改方法是用名词形式，thanks for your invitation，如果这样改的话，就要去掉后面的meme to your birthday party. I`d really much love to attend it, but my mother has just caught a bad cold, and I`d better to stay at home and look after her. I am very sorry.Anyway,wish you a happy birthday.
Yours sincerely（只能是your sincerely或者yours.Yours sincerely是错的）
Olivia（名字和祝福语放右边）
虽然文章没有问题。但是显得有点短。
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