Unit 3 Amazing people grammar课件(牛津版必修2)
Unit 3 Amazing people grammar课件(牛津版必修2)第5页

The usage of the past perfect

By the 1920s, he had become an explorer, searching for the tombs of the Egyptian kings.

Past

Present

He had become an explorer.

The 1920s

Summary: The past perfect tense is often used with time expressions such as when, after, before, as soon as, until, by, for and already.