be的过去式是什么?

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be的过去式是什么?

be的过去式是什么?
be的过去式是什么?

be的过去式是什么?
be 是系动词 一般现在时的情况下 有3种 am ,is ,are 其中 am 和 is 是单数 ,are是复数 .am ,is 的过去式是 was ,are 的过去式是were.过去分词都是been .

be动词人称不同时变为am is are 对应的过去式是 was were

be包括am is are
相应过去式为was was were

was是单数的
were是复数的

be=am is are =was was were

been

was