is are were am was 分别是什么主语的be动词
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isarewereamwas分别是什么主语的be动词isarewereamwas分别是什么主语的be动词isarewereamwas分别是什么主语的be动词（hesheit）iswas,（wethey
is are were am was 分别是什么主语的be动词
is are were am was 分别是什么主语的be动词
is are were am was 分别是什么主语的be动词
（he she it）is was,（we they you）are were,I am