過(guò)去完成時(shí)的結(jié)構(gòu)特點(diǎn)

概念：過(guò)去完成時(shí)表示在過(guò)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(guò)去的過(guò)去( past-in-the-past )”。

過(guò)去完成時(shí)過(guò)去時(shí)現(xiàn)在進(jìn)行時(shí)

構(gòu)成：過(guò)去完成時(shí)由“助動(dòng)詞had +過(guò)去分詞”構(gòu)成，其中had通用于各種人稱。

They had already had breakfast before they arrived at the hotel. She had finished writing the composition by 10：00 this morning.

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