过去将来完成进行时 Past Future Perfect Continuous

表示在过去的时间看来，到将来某一时间动作已经完成（进行了一段时间）并且还在持续进行的动作。

• 结构公式：主语 + would have been + doing
• 否定式：主语 + would not have been (wouldn't have been) + doing
• 疑问式：Would + 主语 + have been + doing...?
• They said tomorrow they would have been using Xinjiang cotton for ten years. —— 他们说了，明天将是他们使用新疆棉花第十周年纪念（持续使用了十年）。
• He told us that by 2025 he would have been teaching here for 20 years. —— 他告诉我们，到2025年他将在这里任教满20年。

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