You are nervous.改为否定祈使句

You are nervous.改为否定祈使句 you are cleaning the blackboard 改为祈使句 you are cleaning your bedroom 改为祈使句 You must look at me like that.(改为否定祈使句) You can sit on the chair.(改为否定祈使句) you can clean the desk(改为否定祈使句) You mustn't waste any time.(改为否定祈使句） "You can't eat anything here."怎么改为否定祈使句? You can't swim in the lake.改为否定祈使句. You cannot feed the birds.改为否定祈使句 you can clean the classroom （改为否定句祈使句） You can put on the new coat.改为否定祈使句