Many things be considered impossible in the past are very common today,还是Many things considered impossible in the past a
问题描述：
Many things be considered impossible in the past are very common today,还是Many things considered impossible in the past are very common today为什么,如果是第二句正确的话为什么省略be
答
这句话的完整形式是Many things which are considered impossible in the past are very common today,which are considered impossible in the past 是定语从句,所以which 和 be动词可以省略掉.如果是这种形式的话M...那为什么不是第一句省略了which呢因为如果要省略的话要一起省略，不能单独的省一个which，如果单独省一个which，要把动词变成动名词，即be变成being