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。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。

Jack, my best friend, is my classmate. Our friendship is like a stream of flowed water. We often help each another in our studies. I was once weakness in English. Only he always explained various English problems to me patient. With his help, my English got better, as which I was grateful to him. As for him, he found it difficult learn math at that time. So I spare no effort to help him with math problems. At last, he made a great progress in math. Now, we are learning painting. No matter what difficult the high school courses are, we'll work hard to be admitting to the best art university.