things we can't do英语作文

Long before,there was a man called Liu bei ,he ever said :" one should not do bad things,even they are small cakes.”
For us students,in ordinary time,we should not be have dad behavior（习惯）:call the name of class,do not finish homework ,sel-fish（自私）,do anything have nothing to do with(有关于） study etc（等等）
we should be a good student,from now on(从现在开始）

I am a middle age, there are so many things, so that we have no way. We still use money to learn knowledge of parents, so now we only mission is to learn knowledge, the return of their parents.so.things we can't do.

There are things that we can't do when we are at school. We can't be late for school. When we are having lessons, we can't chat with the other classmates. We must do our homework and can't copy from others. Also, we can't quarrel or fight with our classmates. We can't do these things if we want to be a good student.