the old man finds it useful to exercise every morning.
题目
the old man finds it useful to exercise every morning.
为什么后面的从句不用it is用it呢?还有什么情况下也这样用?
答案
这是从句的省略用法,如果不省略,全句应为:
The old man finds that it is useful to exercise every morning.
又如乐队'后街男孩'一首歌的歌词是这样的:
I want it that way. 我想那样子.
如不省略,应为: I want that it is that way.
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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