过去完成时与过去完成时的被动语态
[观察例句]
1．When my family and I had just arrived in China，we went looking for a good place to eat in Beijing.
2．Tired，hungry，and not knowing a word of Chinese，we had no idea how to order，so the chef just began filling our table with the best food we had ever eaten.
3．A Sichuan restaurant had been recommended to us by a friend，and finally，we found it.
4．Prior to coming to China，my only experience with Chinese cooking was in America，with Chinese food that had been changed to suit American tastes.
[归纳用法]
1．例句1和2的黑体部分为过去完成时，其构成为“had＋动词过去分词”，表示过去某一时间或动作以前已经发生或完成了的动作。
2．例句3和4的黑体部分为过去完成时的被动语态形式，其构成为“had＋been＋动词过去分词”，表示过去某一时间以前已经被完成的动作。
