we were sweeping the floor.的被动语态

we were sweeping the floor.的被动语态 My mother is sweeping the floor now.改为被动句 _____ they were sweeping the floor ,John came back l saw them were sweeping the floor at that time We are sweeping the floor改一般疑问句怎么改 I cleaned the floor改被动语态 They cieaned the floor.改为被动语态 All the students are sweeping the floor.的同义句 is there a girl sweeping the floor 的答语 the floor needs _____(clean) 要不要用被动语态 She often finds tom clean the floor 被动语态是什么 mary will sweep the floor.变被动语态