You ___ put the liter in the bin.
must
You _______ be quiet in the library.
must
You _______ pay attention at school.
must
You ___ listen to the teacher.
must
You ___ tell Sonya. It's a secret.
mustn't
You ____ swim here.
mustn't
You _____ wear school uniform.
must
You ____ eat snow in winter.
mustn't
Children ___ talk to strangers.
mustn't
You ____do your homework.
must
You ____ use your phone in class.
mustn't
We _______ shout in class.
mustn't
You _____ walk on the grass.
mustn't
She _____ touch the iron.
mustn't