Question

some of your classmates become ill-mannered and used foul language when they disagree with each other or quarrel. discuss with your partner:why they behave this way? The advice you would give them all to behave better.follow up questions 1 how easy /difficult do you think it would be for you......?2do you think the class teacher can.....?

Answer 1

These students lack manners which should be taught to them and they should be warned about the language they use.It should be noted that whenever they use foul language just complain to the teacher.
It will be good to advice him that using foul language in the school is not allowed and you will be punished if you do so.If still he does not stop then last way is to call their parents and ask them if his behaviour is same as here at home.If it is founded to be true then he might need pasychology treatment.

Answer 2

They do a very wrong thing they should be punished of doing such a bad thing

and
Teacher couldn't teach the class or control the class because of such wrong language and misbehaving