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You must study hard.
We must learn English .
They must listen to the teacher.
He mustn’t smoke.
You mustn't be late for school.
You mustn't walk on the grass .
Fill in the blanks.Say must or must not
We ... be quiet.
We must be quiet.
You …….. make noise in this area.
You mustn’t make noise in this area.
We ... eat sweets in the classrooms.
We mustn’t eat sweets in the classrooms.
You ... put the rubbish into the bin.
You must put the rubbish into the bin.