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

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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
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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
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?
时间状语前都不加介词吗？
请举例详细说明

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
in是特指,是固定的时间或地点,every是泛指,例如,i clean my room every morning,如果用in,就是i clean my roon in the morning,是确定的时间.

可以说in the afternoon.
every friday afternoon就是泛指每个周五下午了，你如果再加上in不是画蛇添足了吗？
on是特指某一天
至于at，根本没这说法，一般用语时间，几点钟

有些英语就和中文一样，久而久之习惯了有些地方就不会去追究为什么了，其中也不是什么考点，当做固定搭配来记就好了，出现这个问题大概是因为阅读得少，语感不够强，所以才会觉得为什么用这个对用那个也对的情景.

不用加介词，因为这里是时间状语。

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）