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     Nowadays, more and more students have bad behaviours. People are trying to find out what causes the problem, and what will be led from it. This essay will identify the causes and effects of bad behaviour in schools.

   There are different sources which badly affect students. Firsly, there's lack of dicipline and schools don't have clear rules. When disruptive students behave badly with other students and teachers but the are not punished strictly, they will not distinguish right from wrong. If they know their behaviour is wrong, they may still continue because the rules are not stringent, and thus they will not be punish severely, they will think that they have the right to do what they want, include right things and wrong things. Secondly, many schools have large classes, thus, teachers can not control all of their students. Some classes even have fifty to sixty students. These students are not supervised, certainly behaviour of some of them will be getting worse. Thirdly, it depends on parents' background. Many students' parents are so lenient that they do not punish their children or give them advice when they do something wrong. 

   From reasons mentioned above, there are several consequences of bad behaviour of students that we need to be aware of. Firstly, it is difficult for teachers to teach because of large classes. Moreover, some students are boisterous, thus, the teachers may not inform all the lessons' knowledge to all students. Many will not get the lessons. Secondly, students who are disruptive will have negative effects on other students who are well-behaved. They won't be able to focus on what the teacher is teaching and be baited. Thirdly, those students will become spoilt. Now, they are bad at learning and also behaving. In the future, they will not become good people. 

   In conclusion, to reduce the harmful effects of bad hehaviours of students, schools should have clear rules and parents should teach their children in better ways, which are more strick.