as is known,it is known不同用法?
题目
as is known,it is known不同用法?
答案
As is known to all 是由as引导的定语从句的形式 It is known to all 是由It做形式主语而引导的句子
如 As is known to all,the 2008 Olympic Games was a great success.总所周知,2008奥运会取得巨大的成功.
此时AS是作为非限制性定语从句的引导词
It is known to all that the 2008 Olympic Games was a great success.总所周知,2008奥运会取得巨大的成功.此时it只是个形式主语,真正的主语是由后面that引导的句子.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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