动词be与have现在时与过去时的基本用法
题目
动词be与have现在时与过去时的基本用法
答案
be 一般现在时 is/ am /are he is / I am/ you are a student.
一般过去时 was/ were I was/He was / you were a student a year ago.
have 一般现在时 has / have I have/ You have He has no money now.
一般过去时 had we had no money in the past.
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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