求英语道歉信,朋友请你吃饭,你有事不能去,为此和他道歉并请他找别的人,100词左右,请各位大大帮忙啊!

It's kind of you to invite me to have dinner together.I'd love to,but I'm sorry that I cannot go with you.
暂写到这里,题目没有其他什么要求吗?比如因为什么原因、suggestions等等.要么你自己想个不能去吃饭的理由出来,我写.如果就这点要求,那我就随便想象了
Well,I'll have my Chinese exam tomorrow and I have to go over my lessons.If I don't,I may be in troble.Although I'd love to have dinner with you,but I have to do something more important.As one of my best friends,you will understand me if I refuse your invitation,won't you?When I pass the exam,I'll be free to have my self-relax.But I must go over my lessons as the exam is coming soon.
I'm sorry that I can't go with you.Maybe we can have dinner together next time.Thank you all the same and hope you'll have a good dinner.