请讲解一下were/are having ;will have和have的用法,
题目
请讲解一下were/are having ;will have和have的用法,
答案
were having是过去进行时,表示过去某个时间正在做什么,如：we were having a meeting when the boss came in
are having是现在进行时,表示说话时正在做的事,如：we are having breakfast
will have是将来时,表示将来将发生的事情,如：we will have a meeting tomorrow morning
have是一般现在时,表示事物的常态,如：we have English class every day
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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