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