You must wear a seatbelt while driving.

Students must submit their assignments on time.

Employees must follow the company's dress code.

Parents must monitor their children's online activity.

Travelers must comply with airport security regulations.

You mustn't smoke in this building.

Drivers mustn't exceed the speed limit.

Employees mustn't use company resources for personal gain.

Students mustn't cheat on exams.

Customers mustn't enter the store without a mask.