You must't pack your school bag when you hear the fire bell.（保持原意）

You must't pack your school bag when you hear the fire bell.（保持原意） you mustn't pack your school bag when you hear the fire bell保持原意 You mustn't pack your bag when you hear the fire bell.保持句意不变 You must not pack your school bag when you hear the fire bell改写句子,保持原意 you must install this service pack to complete installation you must keep your pack your shit --Tom,you'better pack your things at once.--There'sno.We don't have to leave till 10:30.在横线上填一词, You must finish your home work改否定句应该用mustn't还是needn't You must (s ) your work,or you won't finish it. if you don't park your car properly,you must pay a fine 的中文意思. You can't do your exercises__pencil,you must do it__a pen You must look ()your camera. ok you must keep your you must obey your father. you must uninstall SPORE?before uninstalling SPORE?Creepy & Cute parts pack When ( ) you pack your things for your holiday?填：will /did Did you pack you bag?这句话对么Did you pack you bag?书上看到的,为什么第二个you不是your?