短文改错。
假如英语课上老师要求同桌之间交换修改作文，请你修改你同桌的以下作文。文中共有
10 处语言错误，每行中最多有两处。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。
One day, a little girl felt down onto the ground. A boy went over and wanted to help her up, but his mother
stopped him, say, "Don't do that, or others will think you had knocked her down."
Another day, the mother, much surprised, saw that their son just watched the fallen oil bottle lying on the
ground as if nothing has happened. When asked why, the son answered, "If I had help the bottle up, you would
have thought that I did it."
I don't agree with what the mother did. I think that parents should let their children to know it is a pleasure
to help others who is in trouble. We are big family. We should care for and help each other.
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，则该粒子是