You _____ brush your teeth three times a day.
must
You ……………. forget to do your homework regularly.
mustn't
You ……………. be nice to your classmates.
must
You …………… wear warm clothes when it is cold outside.
must
You ……………. chew gum in class.
mustn't
You …………….. study hard if you want to pass your exams.
must
You ……………… fight with your classmates.
mustn't
You ………………. play football in the classroom.
mustn't
You ………………. listen to your teacher very carefully.
must
You ……………… forget your best friend's birthday.
mustn't
You ……………… be rude to your grandparents.
mustn't
You..........stop drinking wine.
must
Students …………. talk in the library.
mustn't
Look! There is an intersection ahead. You ………….. slow down.
must
The sign says ‘No swimming'. We ……………..swim here.
mustn't
We ……………….. hurry or we will be late.
must
