be的过去式

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be的过去式be的过去式be的过去式are--weream/is--waswas,were单数was复数weream/iswasarewere过去分词beenam/is-wasare-werebe过去

be的过去式
be的过去式

be的过去式
are -- were
am/is -- was

was,were

单数 was
复数were

am/is was
are were
过去分词 been

am/is -was are-were

be过去式:复数为were,单数为 was。