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.

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:在错的词下划一横线，并在该词下面写出修改后的词。
注意:
每处错误及其修改均仅限一词;只允许修改10处，多者(从第11处起)不计分。
My brother Tom was very selfish when he was a little boy. He did not want share things with other people. For example，when he bought a chocolate cake, he put them in a secret place where I couldn’t find. Then he ate it all by himself. He never helped other. He said he is busy. That is, a game of tennis making him very busy. He did not care if something he did made people angrily. For instance, on one night he played strong and loudly music till four o’clock in the morning. But he is difference now. He often helps grandma with housework, helps mum with cooking and helps his classmates with their lessons.