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过去完成时 do / does




翻译: 产生, 做, 制作, 办, 合适, 完成, 实行, 干, 操, 研究, 算出, 给予, 行, 解答, 可用, 尽力, 施

过去完成时

I had done



过去完成时 (Past perfect)

I
had done 
you
had done 
he/she/it
had done 
we
had done 
you
had done 
they
had done 


不定式

do / does









不规则动词