由時(shí)間狀語來判定

　　一般說來，各種時(shí)態(tài)都有特定的時(shí)間狀語。與過去完成時(shí)連用的時(shí)間狀語有：

　�。� 1 ） by + 過去的時(shí)間點(diǎn)。

　　如： I had finished reading the novel by nine o'clock last night.

　　（ 2 ） by the end of + 過去的時(shí)間點(diǎn)。

　　如： We had learned over two thousand English words by the end of last term.

　�。� 3 ） before + 過去的時(shí)間點(diǎn)。

　　如： They had planted six hundred trees before last Wednesday.
 

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