I wanted to make sure things were ok between us.为什么不用I want
题目
I wanted to make sure things were ok between us.为什么不用I want
说话人在说I wanted to与I want to时,有什么区别?
答案
一个是表示过去,更重要的是使语气更委婉了.应当是这样的.
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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