短文改错
文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(^)，并在其下面写出该加的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：1．每处错误及其修改均仅限一词。
2．只允许修改10处，多者（从第11处起）不计分。
Dear Mr. Brown,
I'm very thankful to you for invite me to stay with you in Beijing in the coming summer vacation. I have been dreamed of seeing you again so that I can get more help from you in my English learning. And I'm afraid I can't go to your place in this summer. I have promised my grandmother, she lives in the country, to spend the summer with her. She misses too much that I find difficult to refuse her invitation. I'm busy now prepare for my examination. I plan to visit you in winter if it convenient to you.
Best wishes,
Li Ming