6. 过去完成时(had done) 表示在过去的某个时间或动作以前已经发生的动作或已经存在的状态。就是我们常说的"过去的过去"。 Until then, his family hadn't heard from him for six months. 到那时为止,他家里已经有六个月没得到他的消息了。 7. 过去将来时(would do) ...
By the time I left the school, he had taught the class for 3 years. 到我毕业时,他已经教那个班三年了. 12. 过去完成进行时:had been doing 表示从过去的过去开始,持续到过去的动作...
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