CLEAN YOUR ROOM.
YOU MUST CLEAN YOUR ROOM.
PAY ATTENTION IN CLASS.
YOU MUST PAY ATTENTION IN CLASS.
RUN.
SHE MUSTN'T RUN.
WRITE ON THE WALLS.
YOU MUSTN'T WRITE ON THE WALLS
SPEAK ENGLISH IN CLASS.
YOU MUST SPEAK ENGLISH IN CLASS.
GO TO SCHOOL.
HE MUSTN'T GO TO SCHOOL.
EAT IN CLASS.
YOU MUSTN'T EAT IN CLASS.
BE LATE FOR SCHOOL
YOU MUSTN'T BE LATE FOR SCHOOL
USE YOUR PHONE IN CLASS.
YOU MUSTN'T USE YOUR PHONE IN CLASS
BE QUIET AT THE LIBRARY.
YOU MUST BE QUIET AT THE LIBRARY.