题目内容：

假如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：1、每处错误及其修改均限一词。

2、只允许修改10处，多者（从第11处起）不计分。

John went shopping in a store, and he forgot to bring a bag. So he buys a shopping bag. After arriving home, it occurred him that he could make a bag by using his old trousers. Several hours earlier, he made himself a very nice bag. His mother was amazing at what he had done. Avoiding spending money unnecessarily is a way of saving. And making a good use of things is an approach to protect the environment. What's more, it is helpful for you to improve the ability to make things by hands. It not only brings us pleasure but reduce waste around us.