are is were was am 分别是什么主语的be动词
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are is were was am 分别是什么主语的be动词
(are were:)you we they( is was:)he she (am)i
只是were was用于过去时
are is were was am 分别是什么主语的be动词
(are were:)you we they( is was:)he she (am)i
只是were was用于过去时