你朋友T0M邀请你参加他的生日聚会,因故不能前往.写一篇给他的100个字英语作文.（包栝祝他生日快乐,感谢他的邀请.不能

Thank your invitation.I would like to join in your birthday party.But my mother is ill, I have to look after her, I could not join in your birthday party.It's a pity not to take part in your birthday party to celebrate your birthday happy. I am sorryI have to say happy birthday to you by writing a letter.I have been prepared a gift for you.I will send to you by EMS.I want to say:Happy birthday to you,Tom.