第1个回答 2010-12-23
I am really sorry I won't be able to attend your Birthday party.
第2个回答 2010-12-23
I am so sorry I can 't join in your birthday party.
第3个回答 2010-12-23
I am sorry i cannot attend your birthday party.
第4个回答 2010-12-23
I am so sorry that I can not join in your birthday.本回答被网友采纳