英语 将下列句子改为祈使句You mustn't be worried about your lessons.Y

英语 将下列句子改为祈使句
You mustn't be worried about your lessons.
You should finish the work before Friday.
You can't smoke in the office.
We should go shopping after school.
You must be careful when you cross the street.
They can play football on the playground,
He has to sweep the floor today.
You can't take photos in the museum.