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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. (责任编辑：admin) |