高中英语语法 过去完成时教案
二、过去完成时的判断依据
1. 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.