though / wanted / expected等或用上述动词过去式接不定式完成式表示即:hoped / planned + to have done。(C)时间名词 + before在句子中作状语,谓语动词用过去完成时;时间名词 + ago在句中作状语,谓语动词用一般过去式。如:He said his first teacher had died at least 10 years before. Xiao Hua left school 3 years ago.(D)表示一就的几个句型:Hardly / No sooner / Scarcely had + 主语 + 过去分词 + when / than / before + 一般过去时。如:We had no sooner been seated than the bus started. = No sooner had we been seated than the bus started.
②在before或after引导的时间状语从句中用一般过去时态代替过去完成时。
After he (had)left the room, the boss came in.
We arrived home before it snowed.
6. 过去将来时
参照一般将来时对比:用would do、was / were going to do sth.表过去将来;come、go、leave等过去进行时表过去将来时;was / were to do sth.和was / were about to do sth.表过去将来。
7. 过去进行时
①过去某一时刻正在进行的动作或某一阶段内发生或频繁发生。
②某一动作发生时另一动作正在发生,其中一个在由when或while引导的时间状语从句中。
8. 现在完成时
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