1．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.
2．When my family and I had just arrived in China, we went looking for a good place to eat in Beijing.
3．A Sichuan restaurant had been recommended to us by a friend, and finally, we found it.
4．... so the chef just began filling our table with the best food we had ever eaten.
[我的发现]
以上句子的时态皆为过去完成时；其中主动语态有：句2、4；被动语态有：句1、3。
