had finished是什么时态

　　The waiter whisked away the plates before we had finished.

　　服务员没等我们吃完就匆忙把盘子收走了。

　　When he had finished washing he began to wipe the basin clean

　　他清洗完后开始把洗脸池擦拭干净。

　　He stood up, signalling to the officer that he had finished with his client

　　他站起身，向警察示意他和他的当事人已经谈完了。

　　They had finished the exam and the teacher was hustling to get the papers gathered up.

　　他们已经考完试了，老师正在赶紧收卷子。

　　She had finished the vegetables and was garnishing the roast.

　　她已经做好了蔬菜，正在给烤肉添加饰菜。