过去将来完成时表示从过去观点看将来某时某动作已完成。在英语时态中，“时“指动作发生的时间，”态“指动作的样子和状态。这个时态用得相对比较少，通常主要用于转述方面，即用于第三、四类条件句及间接引语中。 若表示与过去事实相反的虚拟语气，此时条件从句的谓语用过去完成时(had+过去分词)，而主句谓语则通常用过去将来完成时（would+have+过去分词），当然，主句谓语也可根据情况使用“should (could, might)+have+过去分词”。
过去将来完成时（The past future perfect tense）. 必须强调的是，过去将来时、过去将来完成时和过去将来完成进行时中should/would的用法与在一般过去将来时的用法是相似的，即主...
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... 十四、过去将来进行时 (The Past Future Continuous) 十五、过去将来完成时 (The Past Future Perfect) 十六、过去将来完成进行时 (The Past Future Perfect Continuous) ...
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过去将来完成时 the past future perfect tense 现在完成进行时 the present perfect continuous tense ..
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过去将来完成进行时 would had doing ; The Past Future Perfect Continuous
(过去将来完成时)老师说作业在下周前交。
The teacher said the assignment would have been handed in before next week.
过去将来完成时的被动语态。校长说教学楼将在五月份之前建成。
The headmaster said that the teaching building would have been completed before May.
I have eaten是动词eat的现在完成时；I had eaten是过去完成时；I will have eaten是将来完成时。
'I have eaten' is the present perfect tense of the verb 'to eat', 'I had eaten' is the past perfect and 'I will have eaten' is the future perfect.
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