1. 构成：had+过去分词，
2. 用法：表示过去某时或某动作发生之前已经完成的动作或情况，即“过去的过去”。
（过去完成时一定要以一个过去时间作参照。）
3. 常用连词when，after，as soon as，until，by that time等; 常用的副词如already，just，never等，
以强调事件发生的先后次序：
I didn’t know that she was a famous actress until you had told me.
The boys loved the zoo. They had never seen wild animals before.
在那些用过去完成时的句子中没有明确的时间状语，但通过上下文可以看出动作发生的先后。
专项练习
1. I （sell) the ticket when she came. （come).
2. She (sing) a song to us before she danced.
3. They (begin) to climbed the mountain after they bought all the food and drink.
4. By 10:00 a.m, I _____ very hungry.
5. Lucy____ already ____(finish) the work when I ____(arrive) at home yesterday.
6. By the time he ___(get) to the airport, the plane ___(take) off.
7. He ___(break) his arm when I ___(see) him on the street last week. 8. When he ___(read) the note, he___ (eat) it.
9. Jack ___(not go) to the cinema because he ___(see) the film.
10. We ___(have) the toys for ten years before we ___(give) them to the children.
因篇幅问题不能全部显示，请点此查看更多更全内容