I clean the classroom today 怎么改为被动语态

初中英语短语填空I had to r______ into the classroo because I came very c_____ to being late. i must____(clean) the classroom. Yesterday I-my mother clean the house I often ____(clean) the room. I clean the room改为否定句 I clean the board.怎么改祈使句? I need to clean the room. I forgot clean the door改错 I can;t clean the walls. I often help my mother clean the room.如果clean改成to clean对吗? “Betty sat in the front seat of the classroo“Betty sat in the front seat of the classroom.”I thought she ______in the back.A.had sat B.sat C.has sat D.is sitting Need I clean the room?与Must I clean the room?有什么区别 I clean the room 还是I am clean the room 为什么?不懂啊 仔细点 clean the clean the clean the Clean the i'm too busy to clean the house today 同义转换.i_____________________to clean the house today.