they often clean their classroom often school =they classroom____often____by them?

Are they [ ] [clean] the room. They often help the old man (clean the room.)就括号内提问 ___ ____they often help the old man ____? I often ____(clean) the room. soft,cold,and white,they often come at night.in the morning light,everthing looks clean and brigh They often clean their classroom after school变被动语态 they often clean their classroom often school =they classroom____often____by them? I often help my mother clean the room.如果clean改成to clean对吗? The students often make the classroom ( ) A.to clean B.clean C.to be clean D.be clean 选哪个? Did they clean the room?怎么回答? they prefer__(not clean)the room will they clean the room 改为陈述句 they keep the streets clean by picking up rubbish _________do they keep the streets clean? She often finds tom clean the floor 被动语态是什么 We often clean the room on Monday怎么问? Tom often help me _____(clean)the kitchen My sister often helps my mum (clean)the house. i often help my father (clean)the car on weekends My sister often helps my Mum______(clean)the house.