it seems that he is ill与it seems that he were ill 的区别?
题目
it seems that he is ill与it seems that he were ill 的区别?
答案
前句他事实上有病的可能（他好像是病了）； 后句是虚拟语气,实际上他没病,但看起来像病了
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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