we clean the classroom every Friday afternoon.的句子成分为什么不能说we clean the classroom in every Friday afternoon或we clean the classroom on every Friday afternoon或we clean the classroom at every Friday afternoon为什么?时间状

shall we clean the classroom now We should keep the nice room clean We had to clean all the furniture. We must ___(keep) the classroom clean. The first thing ( ) we should do isto clean the room. The first thing ( ) we should do isto clean the room. we clean the classroom in the afternoom 改为被动语态 We must clean the room 的 clean the room疑问句是_____ ______we do? We must clean the room（对clean the room）急 We must clean the room (对clean the room进行提问 We were made to clean the classroom中to可省吗?clean the classroom做宾补吗 We need to keep the water clean.(改为一般疑问句) _______we_______to keep the water clean? we usually_______have a get together the day.a.do some cleaning b.do clean c.clean d.do some clean we have to clean the classroom every day We often clean the room on Monday怎么问? we have to clean the classroom改为一般疑问句 We have to clean the house ( ) time to time. we should keep the water clean(改为一般疑问句）