I must brush my teeth every day.
I must wear a coat if is cold outside.
You must wear the uniform at school.
You must do your homework .
You must listen your teacher.
She must lock the door when she is alone.
We must be quiet during the class.
They must play guitar at 4 p.m.
We must arrive on time at school.
I must eat a fruit every day.
You must wash your face every morning.
You should close the window because it's cold.
They should close the door when he enter.
They should wear a clean T-shirt.
We should help our mothers.
You should play football in the field.
I should change my clothes.
They should wet the flowers.
You should do exercises if you want a good mark
you should wash your hands.
We should help our grandparents.
