are is were was am 分别是什么主语的be动词

are is were was am 分别是什么主语的be动词
are is were was am 分别是什么主语的be动词

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