Написать письмо на .вы не пришли на день рождение другу письмо-извинений.1 ,2извинение,3 почему не пришли,4 поздравление до слов 50

Dear Kate,
Thanks for your invinting for Birthay.
Sorry. I could not to go there. My dad was ill and nobody could drive me.So, Happy Birthay! You will have a suprise from me on Monday.
See you than.
Your friend,
Name