There is a time when 和it is the first time后的句子是用什么时态?
题目
There is a time when 和it is the first time后的句子是用什么时态?
答案
There is a time when 后面加一般现在时
There is a time when we go to dinner
it is the first time 后面加现在完成时
it is the first time I have been to beijing
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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