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短文。短文中共有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（∧），并在此符号下面写出该加的词。

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. Yang,

    I am writing to let you know that I needed your help with my English writhing. Which is known to all, grammar plays a very vital part in the writing. But I feel that I have some problems of my grammar. I am afraid that I am not able to identify my specifically errors. I would be grateful if you could point out and correct your mistakes. What is more, I used to the Chinese way of thinking, which stops me organize my writing in a proper way. I am wondering that you could also help me improve the structures of my writing.

    I am looking forward to making great progresses under your instruction. Thanks are extended to you in advance!

Yours sincerely,

Li Hua