It is common knowledge that computers are super calculators .这句话是定语从句吗?那么that充当什么成分呢?
问题描述：
It is common knowledge that computers are super calculators .这句话是定语从句吗?那么that充当什么成分呢?
答
这句话不是定语从句 that后跟的是主语从句
it是形式主语
真正的主语是that computers are super calculators
还原后 是that computers are super calculators is common knowledge .
为了防止句子头重脚轻 才放到后面的