9 предложений на тему школьные управляла

You should submit home assignments in time.
You should wear a uniform.
You must not skip the classes.
You must not throw rubbish at any place but a trash can.
You should come to classes in time.
You should look up to teachers and greet them if you do not know them.
You must not use mobile phones at lessons.
You should turn off the light before leaving a classroom.
You must not write on desks.