Dear Tony:I am so sorry to tell you that i can not come form supper on Dec 15th as i've date with Monica to join pop music concert that day.Best regards,Robert Berns老兄你也够少的。这我还要你帮忙。。还需要其他什么内容？200字Dear Tony,Hope you are doing well. I am sorry to tell you that i can not come for supper with on Dec 15th. I have made date with Monica to go to the pop music concert that day before you asked me. But i forgot it until she reminded me again today and required that i can not miss the concert. So i agree to go with her first.I feel really sorry for this matter andhope you can understand. Will it be possible that we make the date later? If Dec 16 is possible for you, please let me know. Wish we two can enjoy ourselves then. Also i will bring something special to you. It's a secrect now and i believe that would be a great surprise to you.Looking forward to hearing from you soon. Best regards,Robert Berns希望采纳