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Dear John I'm gald to recieve the invitation on having dinner with you .It is a pity that I can't show up in front of your family on time. I'm sorry but I have to prepare for an exam on the day after tomorrow.I have been waiting for the exam for a long time.I need this opportunity to prove myseif in the whole class.I believe I can beat everyone to get to the top.What I need is time. If you can forgive me ,I will appreciate it.When I finish my exam,I would invite you to my house to have a big dinner and we can watch SHERLOCK together. yours, sincerely Li Hua