假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误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：在错的词下划一横线，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 London in the coming vacation. I have been dreamed of seeing you again so that I can get more help from you in mine English learning. And I’m afraid I can’t go to your place in this summer. Because I have promised my grandmother, she lives in the country, to spend the summer with her. She misses me too much that I find that difficult to refuse her request. I’m busy now preparing for several examinations. I plan to visit you in winter if it convenient to you.
Best wishes.
Li Ming