初中英语知识点：过去完成时由时间状语来判定
由时间状语来判定一般说来，各种时态都有特定的时间状语。与过去完成时连用的时间状语有：
（ 1 ） by + 过去的时间点。
如： I had finished reading the novel by nine o'clock last night.
（ 2 ） by the end of + 过去的时间点。
如： We had learned over two thousand English words by the end of last term.
（ 3 ） before + 过去的时间点。
如： They had planted six hundred trees before last Wednesday.
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