短文改错。
假定英语课上老师要求同桌之间交换修改作文，请你修改你同学写的以下作文。文中共有10处语言错误，每句中最多有两处。错误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仅限一词；
2．只允许修改10处，多者(从第11处起)不计分。
As we all know that, teachers are very important to us. They not only open our eye to a wonderful world of knowledge, but also teach us how behave. It is undoubted that they are worthy of their respect. We should always be grateful to them. Therefore, we ought to obeying the school rules. We should come to school in time and not make some noise in class when our teacher is conducting out the lesson. That is the more necessary and easiest thing which the students should do. Only by doing so can we show our really respect to our teachers.
