need to be cleaned我们的教室需要被清理所以用被动时态,need是谓语,clean是谓语,一个句子不能出现两个谓语,所以用to do或者ing时态,有因为to do是将来的时态,ing一般表正在进行的,而清理教室是降要的,所以用to be
Our classroom need______!(clean)every day
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