英语语法：过去完成时基本结构
由 had 加动词的过去分词构成。例句：
She said she had never been to Paris. 她说她从未去过巴黎。
When the police arrived,the thieves had run away. 警察到达时，小偷们早就跑了。
By the time he was twelve,Edison had begun to make a living by himself. 到了十二岁那年，爱迪生开始自己谋生。
页:
[1]