语 境 自 主 领 悟
先观察原句
后自主感悟
①By the 1920s，he had become an explorer，searching for the tombs of the Egyptian kings.
②I returned the book that I had borrowed.
③Upon their entering the tomb，Cater's lucky pet bird，which he had left in Cairo，was swallowed by a snake.
④Then，a few months after Carter had opened the tomb，Lord Carnarvon，who was also present when the tomb was opened，fell ill with a fever and died in Egypt.
⑤He said he had worked in that factory since 1949.
⑥I had been at school for half an hour when Li Lei came.
1.过去完成时的构成：had＋过去分词。
2.过去完成时表示在过去某一时刻或动作以前已经完成了的动作，即“过去的过去”如句①②③④。
3.过去完成时可以指过去的动作延续到过去的某个时刻，如句⑤⑥。
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