過去完成時(shí)：

1.概念：以過去某個(gè)時(shí)間為標(biāo)準(zhǔn)，在此以前發(fā)生的動(dòng)作或行為，或在過去某動(dòng)作之前完成的行為，即“過去的過去”。

2.時(shí)間狀語：before, by the end of last year(term, month…),etc.

3.基本結(jié)構(gòu)：had + done.

4.否定形式：had + not + done.

5.一般疑問句：had放于句首。

6.例句：As soon as we got to the station, the train had left.

By the end of last month. We had reviewed four books

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