You clean the blackboard,Mary.这句话有语法错误么

you should clean the can you clean the room? you must clean the window对clean the window提问 Clean the room can you help me You must keep the bedroom ______(clean) lucy,you clean the blackboard today, can you ( )(help )me clean the classroom You must clean the classroom.(改为祈使句) mary,you (clean) the table now? yes. how do you clean the classroom Alice,would you please tell me___?A.where is mr,blackB.what is happened to uC.when did the school bus leaveD.what's your trouble为什么不可以选b 要选d?错了 是could。 _______ you keep the room clean you may use it You must clean the classroom, you? 中间要填什么 clean the clean the clean the Clean the Who helped you clean the room?（改为被动语态）Who_______you_______to clean the room?