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过去完成时 sing




翻译: 唱, 唱歌, 演唱, 啼, 鸡叫
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过去完成时

I had sung



过去完成时 (Past perfect)

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


不定式

sing









不规则动词