Dear Bob: Thank you for your invitation, but I'm sorry, I can not go, because my father was sick, I'm going to take care of him, I wish you a happy birthday. thanks! Your dea
Dear BOB:How is every thing going ?Several days ago I have received your letter.I have known that your birthday will come,I am glad to hear that. I am looking forward to taking part in your birthday
Dear Bob, Thanks for inviting me to your birthday party.But I'm sorry I can't go.I have to care for my father. Happy birthday ! . Send my regards to other friends. Yours , ***
I'm very glad to get your letter.But I'm sorry I can't to go your birthday party because my father was ill. Please instead of me say hello to my friends .Thanks for your understanding .
Dear Bob, I'm glad to receive your invitation of your birthday party ,but i'm so sorry to tell you that my father feel not good and i can't leave him alone. So please excuse me and wish you well