2.过去完成时的用法 ①“已完成”用法 表示某一动作或状态在过去某一时间之前或过去某一动作之前已经完成。句中常用by引导的时间状语或以 before, until, when, than等词引导的内含一般过去时的时间状语从句。 By 5:00 yesterday morning we had done that work. 到昨天早上5点钟时,我们已经做完了那件工作。 He had just finished sweeping the classroom when the teacher returned from the office. 老师从办公室回来时,他刚把教室打扫完。 They came earlier than we had expected. 他们到得比我们预料的要早。 I had learnt 5000 words before I entered the university. 我在进大学之前就已学了5000个单词。 It rained yesterday after it had been dry for many months. 旱了好几个月之后,昨天下雨了。 注意: 在包含before和after
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