题目内容：

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．

My grandpa is a retired teacher． He used to teaching in the school of his village． At that time he was only teacher in the school which taught all the grades all the subjects． He worked there for nearly forty years． He was so busy that he hardly had time for his families． During those years， grandpa was willing devoted to his work． Since his retirement， great changes have been taken place in his village but a new school building has been completed． Today the students will move into the new building． For the invitation of the school， grandpa will give a talk to the teachers and students as a guest of honor． Grandpa is exciting about it． He will give a gift to the school， which is a name list of all the students he teaches．