Question

Students of class room do not switch of the lights when they leave the classroom. I need some conversation for 1min

Answer 1

please be polite and told the students to do not do this again

Answer 2

we should be polite to those type of students and ask them to switch of the lights when they are leaving the classroom and also tell them if they do it again you will tell this to the class teacher and ask him or her to tell them to switch off the lights. If the do not mend their ways then you should itself switch off the lights while leaving the class.