看句英语,请高手讲解下时态
题目
看句英语,请高手讲解下时态
It will be Obama's first opportunity to speak publicly about his decision to cancel the summit with President Putin.They were to have met in Moscow before next month's G-20 summit in St.Petersburg.
They were to have met,这个具体是怎么用时态的
答案
were to do 是虚拟语气表将来,have met 是完成,就是在G20开始之前,他们已经会过面了,但是因为没会面,所以用虚拟
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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