看句英语,请高手讲解下时态
问题描述：
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
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