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（
）, 并在其下面写出改加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词下划一横线，并在改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 Ms Brown,
I’m writing this letter to express my thanks to you for help me with my English study during the past three years. I can still remember how poor my English was when I come to senior middle school. I even felt frightening each time I attended an English class. Know this, you communicated with me patient and let me know the important of learning English well. Then you taught me many useful ways to learn English and even spent many of your free time helping me, for which I have always been grateful. With your help, I finally made a great progress. I could hardly believe my ears when the news came I was admitted into a key university.
Ms Brown, it’s you that has changed my life and made my dream come true. Thank you.
Yours sincerely,
Li Hua