增加一些从句的使用,文章会更不错;词汇表达较灵活准确,高级词汇使用过少,另外注意文中个别的拼写错误;语言不流畅。
Dear John, Hi! John. I am LiHua. I am so sorry for that I can't go for dinner with your family. Thank you for yur invition. I have the exam after day.Recently I am busy with the exam . As you know , this exam is very important to me. If I don't pass the exam , my dad will be angry . So I must working hard . I hope you can have a nice day. I think we could about another day .