Don't eat in the classroom.中in the classroom是什么成分

Don't eat in the classroom.中in the classroom是什么成分（作地点状语）
We don't have to come to school every day.中We是什么成分（作主语）
I must get up early at 6:30every morning.中 at 6:30every morning是什么成分（作时间状语）
What are the rules?中are是什么成分（are是系动词,和表语the rules一起构成谓语）
I must do my homework after school.中must do是什么成分（作谓语）