文中衔接词和过渡词使用的很棒;文中词汇表达比较多样,能多用高级词汇就更好了;作者应适量增加从句的使用量。
Dear John, Thanks for your invitation for me to have a meal with you and your family tomorrow evening, which I deem as one of the best honor occur to me. While I am so desire for having dinner with you and your family, there is something that I couldn't throw away, which in effect is the important exam that would be taken after tomorrow, consequently, I have to prepare for it otherwise an expected misfortune will come to me--fail to pass the exam. As a result, I am so pitiful to say that I could not attend your dinner the next day. I really hope that you will have a unforgettably happy time with your family tomorrow, you can invite me another time when I am free, or I will invite you to my home in turn. yours sincerely Li Hua,