You ( must / mustn't ) ___________.
mustn't pick the flowers
You ( must / mustn't ) ___________.
mustn't climb the tree
You ( must / mustn't ) _________.
mustn't spit
You ( must / mustn't ) _________ in the classroom.
mustn't run
You ( must / mustn't ) ___________.
You must line up.
You ( must / mustn't ) ___________.
You must listen to the teachers.
You ( must / mustn't ) litter.
mustn't
You ( must / mustn't ) ___________.
must sit still
You ( must / mustn't ) _________.
must keep quiet
You ( must / mustn't ) keep off the grass.
must