概念：表示在過去某一時(shí)間或動(dòng)作之前已經(jīng)發(fā)生或完成了的動(dòng)作，即“過去的過去( past-in-the-past )”。

構(gòu)成：“助動(dòng)詞 had + 過去分詞”，其中 had 通用于各種人稱。

They had already had breakfast before they arrived at the hotel.在到達(dá)旅館之前，他們已經(jīng)吃過了早飯。

She had finished writing the composition by 10：00 this morning. 今天早晨10點(diǎn)之前，她已經(jīng)寫完了作文。

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