过去将来完成时
形式
should / would have done sth.
用法
1、 过去将来完成时表示在过去将来某一时间以前发生的动作,并往往会对过去将来某一时间产生影响。
I thought youd have left by this time. 我想这会儿你已经走了。
He told them he would have finished it by 8 oclock. 他告诉他们他会在8点以前干完。
I guessed that Helen would have told her something. 我猜海伦会告诉她一些情况的。
2、 过去将来完成时还常用在虚拟语气中,表示与过去的事实相反。
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