1、过去将来完成时
1、概述
过去将来完成时表示从过去观点看将来某时某动作会业已完成。
I thought she would have told you something by then.我想届时她已经告诉你一些情况。
He knew by the time he arrived she would have gone home.他知道他到时她会已经回家了。
2、构成
过去将来完成时是由would/should + have + v-ed构成，其否定形式是would/should +not+ have + v-ed；疑问形式是将should/would提前。
She said
2、she would have finished her exams by then.她说那时她会已经考完试了。
I thought mother would have made some sandwiches by the time we got back.我想我们回来时妈妈已经做好了一些三明治。
3、过去将来完成时的用法
过去将来时表示从过去看来将来某时之前已经完成的动作。这种时态用的较少，通常只见于转述方面。
He said they would have arrived by seven o’clock.他说他们七点钟前就会到达。
She told me that she would have finished typing the letter before I came back.她告诉我，我回去之前她就会把信件打好了。
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