If I had had enough money,I should have boght it.
题目
If I had had enough money,I should have boght it.
句中的两个had had 有什么却别,请讲的详细点.
答案
这里是虚拟语气,前面的是语法的用法后面是有的意思(过去完成时)
如果我用足够的钱,我已经买下它(但说话的人是假设,他或她当时根本没钱)
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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